Re: [sage-support] What do the different `make ****clean` targets do?

On 02/11/2018 08:57 PM, rickhg12hs wrote: > I've built from source to get a performance boost (I hope) and I'd like > to know when I should use the different levels of `make clean`.  In > the top-level make file I see, "misc-clean, bdist-clean, clean, > distclean, build-clean, bootstrap-clean,

Re: [sage-support] Simplifying symbolic expression with radicals

On 10/16/2017 04:21 PM, Emily G wrote: > > (*2* + sqrt(*2*))/(*1* + sqrt(*2*)) > > The above example should simplify to sqrt(2), > but simplify_full() and canonicalize_radical() don't work. Is there a > way that I can get Sage to simplify such expressions? > This gets the result that you want,

Re: [sage-support] Issue with ticket number #29146

On 03/03/2017 08:32 AM, Ashutosh Ahelleya wrote: > > No. I guess the back end does return a complex parameter in cases where the > answer is a complex solution. > This might be an appropriate example: > { { sage: > x = var('x') > eq = x^2 -3*x + 4 > solve(eq,x) > [x == -1/2*I*sqrt(7) + 3/2, x

Re: [sage-support] Issue with ticket number #29146

On 03/02/2017 10:57 PM, Ashutosh Ahelleya wrote: > Hello, > > I am interested in solving the documentation error having ticket number > #29146 but I have a doubt. > > In the description of ticket number #29146 > , I feel within the domain of x > that

Re: [sage-support] simplifying radicals of trigonometric expressions

On 01/14/2017 03:42 AM, Enrique Artal wrote: > This is true. The problem is that if not used, simple expressions keep to > be too much complicated. Is there any compromise? > There is simplify_full() which should be safe for all expressions, and simplify_real() that assumes everything is real.

Re: [sage-support] Displaying graphics from a Sage script

On 01/13/2017 06:50 PM, John H Palmieri wrote: > This question comes from > http://stackoverflow.com/questions/41638257/graphics-in-sage-script: if I > have a file "foo.sage" and I want to run "sage foo.sage" and have it pop up > a window displaying a plot, how do I do this? > > For example,

Re: [sage-support] simplifying radicals of trigonometric expressions

On 01/13/2017 05:12 AM, Enrique Artal wrote: > I would like to know how to handle with this issue. Consider a function > f=sqrt(cos(x)^3 - 3*cos(x)^2 - cos(x) + 6). It is possible to deal with > this function for standard procedures like numerical_integral in (-1,1). > If one considers

Re: [sage-support] Re: Plotting long functions

On 12/29/2016 04:46 AM, Fjordforsk A/S wrote: > Thanks Michael. I am plotting it now, and it is just waiting without giving > a crash. > Is it automatically right to use complex_plot command to plot the imaginary > part of the same plot as given below? > It depends, do you expect your

Re: [sage-support] simplify

On 12/29/2016 04:48 AM, Ingo Dahn wrote: > > According to tab completion SageCell doesn't seem to support any other form > of *simplify*. Is there any strategy to combine Sage commands in order to > simplify rational function expressions? Plain "simplify" won't do much on its own. I guess it's

Re: [sage-support] Re: Plotting long functions

On 12/28/2016 10:33 AM, Fjordforsk A/S wrote: > This is how its supposed to go: > > sage: plot3d(((1 - (3/8 - 3*t^2 - 2*t^4 - 9*x^2 - 10*x^4 - 12*t^2*x^2) + > i*x*(15/4 + 6*t^2 - 4*t^2 - 2*x^2 - 4*x^4 + 8*t^2*x^2))/(1/8*(3/4 + 9*t^2 + > 4*t^2+ 16/3*t^6 + 33*x^2 + 36*x^24 + 16/3*x^6)))*e^(i*x)),

Re: [sage-support] Plotting long functions

On 12/28/2016 07:12 AM, Fjordforsk A/S wrote: > Hello, I am not sure on the reply sage gives me on plotting a long function: > > sage: plot3d(((1 - (3/8 - 3*t^2 - 2*t^4 - 9*x^2 - 10*x^4 - 12*t^2*x^2) + > x*(15/4 + 6*t^2 - 4*t^2 - 2*x^2 - 4*x^4 + 8*t^2*x^2))/(1/8*(3/4 + 9*t^2 + > 4*t^2+ 16/3*t^6

Re: [sage-support] how to force the use of Atlas instead of Openblas during the build of 7.4?

On 11/04/2016 05:17 AM, Dima Pasechnik wrote: > Documentation on this is lacking. > It's a ./configure option, --with-blas=atlas. And at least in the near future, a good place for it would be in the error message you get after OpenBLAS fails to compile... -- You received this message because

Re: [sage-support] linear solutions

On 09/10/2016 04:41 PM, Anton Sherwood wrote: > I haven't guessed the right keywords. How do I solve a set of linear > equations in which the coefficients are symbolic expressions like > a^2-sqrt(b)? > Try creating vectors/matrices over the symbolic ring "SR", and then use solve_left or

Re: [sage-support] Substituting values for variables

On 06/13/2016 11:02 AM, saad khalid wrote: > Hey everyone: > > So, I start by making a symbolic function. Gamma(k) is the sum of some > variables, u_i. Generating the function by hand is difficult, so I was > hoping I could make it so that Sage generates the function and then I > can give values

Re: [sage-support] Re: sqrt(x) * sqrt(y) versus sqrt(xy)

On 05/24/2016 10:20 AM, Vincent Delecroix wrote: > > The above is coherent. But I would prefer if simplify_real would raise > an error if some argument of sqrt has a chance to be < 0. > What about sqrt(2*x^16 + 10*x^11 - 9*x^10 + x^7 + x^4 - 17*x^2 - x)? -- You received this message because

Re: [sage-support] Re: sqrt(x) * sqrt(y) versus sqrt(xy)

On 05/24/2016 09:55 AM, Vincent Delecroix wrote: > Well > > sage: (sqrt(-x) * sqrt(x) * sqrt(-x) * sqrt(x)).simplify_real() > -x^2 > If you're sure that every expression involved is real, that's still the correct answer, because x == 0. If sqrt(x) or sqrt(-x) might not be real, you're going to

Re: [sage-support] sqrt(pi)*sqrt(n) != sqrt(pi*n)

On 05/10/2016 04:56 PM, Vincent Delecroix wrote: > still > > sage: n = SR.var('n') > sage: assume(n, 'real') > sage: assume(n >= 0) > sage: bool(sqrt(pi)*sqrt(n) == sqrt(pi*n)) > False > What `bool(expr1 == expr2)` does is something like, bool((expr1 - expr2).simplify_full() == 0) As long

Re: [sage-support] sqrt(pi)*sqrt(n) != sqrt(pi*n)

On 05/06/2016 09:50 PM, Marc Tardif wrote: > Hi folks, > > When comparing the product of two square roots to the square root of > the product using two scalars, I get True: > > sage: bool(sqrt(pi)*sqrt(2) == sqrt(pi*2)) > True > > But when using a variable instead of one of the scalars,

Re: [sage-support] Re: is_prime() error

On 04/05/2016 01:03 PM, William Stein wrote: > > I think we should change is_prime for rational numbers, since people > get confused by this so much. > > How? Pretty much any change at all would be better than the current > situation. Options I can think of: > > - make is_prime([rational])

Re: [sage-support] Moore–Penrose pseudoinverse?

On 03/24/2016 10:44 AM, Jeroen Demeyer wrote: > Does anybody know of an implementation of the Moore–Penrose > pseudoinverse (a generalised inverse for matrices) in Sage? I couldn't > find anything, but just in case I RTFM badly or it's known under some > different name, I ask here. > I looked

Re: [sage-support] Linear algebra and least squares regression

On 02/29/2016 10:19 PM, Emerson Misch wrote: > I am new to sage and have little knowledge of its computing power and am > interested in the coding for a few things. > > 1) Creating a vector space V over the field of Svalbard (all reals) or C of a > given dimension n. sage: VectorSpace(RR,n)

Re: [sage-support] console prompt color

On 01/26/2016 10:17 PM, Volker Braun wrote: > On Tuesday, January 26, 2016 at 5:09:52 PM UTC-5, Michael Orlitzky wrote: > > You're just using "reasonable" to mean "has the color scheme I like." > > > That black text on white background is the most legib

Re: [sage-support] Writing 'n' variables in Sagemath linux ubuntu

On 01/27/2016 12:47 AM, Jori Mäntysalo wrote: > If I understood this, isn't > > var(['a'+str(i) for i in range(1,4)]) > > what is wanted? It will make a1, a2 and a3 to variables. > Yeah, but then you can't reference them later. -- You received this message because you are subscribed to the

Re: [sage-support] compile sage from source to link to existing applications

On 01/26/2016 01:13 AM, bernard ck Wong wrote: > Hi, I am wondering if it is possible to compile Sage from source and > configure it in such a way that it will use software that is already > installed in my system instead of building the bundled ones? For > example, I have R, Singular and Maxima

Re: [sage-support] console prompt color

On 01/24/2016 03:03 PM, Jagdpanther wrote: > I just compiled SageMath 7.0. Both the console and notebook interface > seem to work well. I use a dark gray background in my xterm (uxterm) > window where I run sage (console) and the dark blue "sage:" prompt is > hard to see. How do I change the

Re: [sage-support] Re: [sage-edu] Writing 'n' variables in Sagemath linux ubuntu

> On Tue, Jan 26, 2016 at 3:01 AM, Usman Afzal wrote: >> If I want to write one variable, the command is >> x=var('x') >> >> But I want to write "n" variables namely x1, x2, . . . , x(n). How can I >> write this? This is http://trac.sagemath.org/ticket/11576, but it's dead in

Re: [sage-support] console prompt color

On 01/26/2016 03:30 PM, Volker Braun wrote: > On Tuesday, January 26, 2016 at 12:16:01 PM UTC-5, Michael Orlitzky wrote: > > The default should be NoColor, since whatever color scheme we choose is > going to be awful for a large number of users. > > > I disagre

Re: [sage-support] Re: Server and certificate chain

On 11/12/2015 12:00 AM, kcrisman wrote: > > Can Sagenb send certificate chain instead of just certificate of the > server itself? If yes, how? > > If not, what do you use as a frontend? Apache? > > > Cc:ing someone who may know this; I don't know anything about the > certificates.

Re: [sage-support] Where is possible to view the code of one command? for example: lagrange_polynomial?

On 10/05/2015 10:05 AM, Dmitrij Moreinis wrote: > Hi everyone, where it is possible to find the code of each command or > maybe documentation? For example lagrange_polynomial. How can one see > the function code, but documention would be better. Thank you in advance. > Type the function name

Re: [sage-support] Interpolation in Sage

On 07/22/2015 04:04 PM, Santanu Sarkar wrote: Hello, I want to find a polynomial f(x_1,x_2,x_3,x_4) explicitly by interpolation. I know that the degree of f is 2. I have enough data points. How can I do this in Sage? I have some code to do this here:

Re: [sage-support] What is wrong with this SAGE function?

On 06/04/2015 05:53 PM, Phoenix wrote: Thanks! Is there otherwise any standard operation in SAGE to create such vectors? If the construction isn't too complicated, a list comprehension usually suffices. This will do what you want, I think: def elem(i,n): return [ ZZ(i == j) for j

Re: [sage-support] Decimal Answers

On 05/11/2015 03:40 PM, Selah Bryce wrote: Thank you. It gave me 9.13877574435632e10. What does that mean? It means 9.13877574435632 times 10^10, or 91387757443.5632. The e10 at the end is scientific notation. I don't know where the 'e' came from, but I would guess it stands for exponent and

Re: [sage-support] difference between SR.symbol and SR.var

On 04/10/2015 05:09 PM, Daniel Krenn wrote: Can someone explain me the difference between SR.symbol and SR.var ? (BTW: SR.symbol does not have a description) SR.symbol is faster, but only lets you declare one variable at a time. SR.var will parse a string, so something like SR.var('x,y')

Re: [sage-support] Re: How to turn off colored prompt?

On 02/06/2015 08:49 PM, P Purkayastha wrote: The colors are controlled by ipython. You can run the following to create a default profile and get the path to the configuration file ~» sage -ipython profile create default Inside the file there is a color configuration. See this website for

Re: [sage-support] Real symbolic variable

On 01/29/2015 06:14 PM, Christophe Bal wrote: Hello. Indeed, I just want to define complex number via the algebraic form z=a+i*b. expr.simplify_real() will be a great tool. I will be patient... It's actually already there, but at moment all you'll get out of it is abs(x) == sqrt(x^2).

Re: [sage-support] Real symbolic variable

On 01/28/2015 03:56 PM, Christophe Bal wrote: Hello. How can I define a symbolic variable that is a real number ? Therer is an optional argument real in the latest versions of Sympy but this not work in Sage. There isn't much support for declaring a variable real in Sage. By default every

Re: [sage-support] How to close a plot.

On 01/28/2015 10:27 AM, Volker Braun wrote: On Wednesday, January 28, 2015 at 4:18:50 PM UTC+1, kcrisman wrote: Does anyone think this might be useful to add to the FAQ or documentation (if so, where?)? IMHO we should not make any guarantees about the behavior of showing plots besides

Re: [sage-support] How to create and use lists of variables?

On 10/28/2014 10:47 PM, smohamm...@gmail.com wrote: Thank you so much! I'm sorry I couldn't answer earlier. It worked as I expected. Now as the last question on this discussion, do I need to use 'SymbolicSequence', when I want to numerically solve a large ODE system? I tried to use

[sage-support] Spectral decomposition / factorization

I have a symmetric real matrix 'A', and I need to factorize it as X(X^T). An n-by-k X where k=rank(A) would be ideal, but a square X with zeros is fine too. Is there a built-in method I'm not seeing? Or something simpler than looping through the eigenvectors? -- You received this message

Re: [sage-support] How to create and use lists of variables?

On 10/25/2014 11:40 PM, smohamm...@gmail.com wrote: Thank you Michael, I loaded the file and succeeded to make a list of symbols. But now and after evaluating my expression in terms of its elements, how should I assign them different values I want the expression to be calculated for? (see a

Re: [sage-support] How to create and use lists of variables?

On 10/22/2014 01:22 PM, smohamm...@gmail.com wrote: Hello to every one, I am a *primitive *sage user and I want to produce a function of n variables (|x[1],x[2],...,x[n]|), in nested 'for' loops. I've searched in sage's documentation, but I have still 2 problems: 1. How to define a list of

Re: [sage-support] Re: Strange characters in sage terminal

On 08/18/2014 04:05 PM, Oscar Lazo wrote: Yes, I ran uxterm and I still see strange characters there. Any ideas? Thank you, You also need to be using a font which supplies those glyphs. I think the DejaVu family should have them if you want to test using that. -- You received this message

Re: [sage-support] Options for the Sage expand function

On 06/14/2014 12:43 AM, jeanbigbo...@gmail.com wrote: I am coming up to speed on Python, Sympy, and Sage by doing some simple problems on all three. Sympy has an option for its expand function, complex=True, that has made some of my expressions easier to read/use. I'm working with quotients

Re: [sage-support] Zero power zero

On 04/16/2014 08:08 AM, Jori Mantysalo wrote: print 0^0 var('n') simplify(0^n) prints 1 0 Is this a bug or feature? Bug, 0^0 is undefined in Maxima but 0^x is 0. In Sage we've standardized on 0^0 == 1. -- You received this message because you are subscribed to the Google Groups

Re: [sage-support] Plotting equation of two perpendicular lines

On 04/16/2014 05:35 AM, omid habibi wrote: Thanks for reply, Can you tell me how should I change the ratio? On Wednesday, April 16, 2014 1:40:04 PM UTC+4:30, John Cremona wrote: For both graphs you have set the x-range to -10..10 but the y-ranges are different, and the graph has

Re: [sage-support] bool function fails!?

On 04/13/2014 12:16 PM, Daniel Edler wrote: I wanted to show that two equations are equal so I used the bool() function. Unfortunately sage (6.1.1) do not see that it is equal but obviously they are. If I replace log(x) with -log(1/x) it works and the replacement itself is also true for sage.

Re: [sage-support] Polynomial question.

On 12/11/2013 07:40 AM, Thierry Dumont wrote: Ok, this is correct, and seems nice; but I want to evaluate these polynomials for different values of x, and you cannot evaluate a member of Integer Ring at say, x=1/21... So I need to compute the parent of polynomials (which possibly are

Re: [sage-support] Evaluate all expressions

On 09/26/2013 03:13 PM, Michael Orlitzky wrote: On 09/25/2013 03:24 PM, Bassie wrote: Hello Can you evaluate all expressions at one? Like say, if i made a mistake 5 expressions before my last expression, and this mistake is reapeated in all the 5 last expressions, do I have to evaluate all 5

Re: [sage-support] Evaluate all expressions

On 09/25/2013 03:24 PM, Bassie wrote: Hello Can you evaluate all expressions at one? Like say, if i made a mistake 5 expressions before my last expression, and this mistake is reapeated in all the 5 last expressions, do I have to evaluate all 5 expressions? When you have enough code that

Re: [sage-support] sin(x)/cos(x)

On 06/11/2013 10:44 PM, robin hankin wrote: OK thanks for this, bug reported [at least, I think it is. I couldn't see it on trac]. Now what about this: sage: solve(sin(x) + cos(x) == cos(2*x),x,to_poly_solve=True) [x == 2*pi*z264, x == 2*pi*z268 + 1/6004799503160661*I - 355/452, x

Re: [sage-support] sin(x)/cos(x)

On 06/11/2013 04:43 PM, robin hankin wrote: hello. Sage 5.9: sage: solve(sin(x)/cos(x)==1,x,to_poly_solve=force) [] I find this unexpected because pi/4 is a solution, and sage seems to indicate that there are no solutions. Sage can handle the equation if I do some

Re: [sage-support] sin(x)/cos(x)

On 06/11/2013 07:26 PM, robin hankin wrote: OK Michael, thanks for this. But my problem was solve(sin(x)/cos(x)==1,x,to_poly_solve=force) returns an empty solution set, implying that there are no solutions when in fact there are. Surely this is misleading? Worthy of a bug report?

Re: [sage-support] Quickly compute signs of eigenvalues

On 05/20/2013 05:19 PM, Theo Belaire wrote: I have a large computation where I need to compute the number of positive eigenvalues of a matrix. I am currently computing all the eigenvalues then counting how many are positive, but I see when profiling that {method 'roots' of

Re: [sage-support] Re: Maxima-in-Sage versus plain Maxima

On 03/04/2013 11:10 AM, Jeroen Demeyer wrote: Fair enough, but what if I want the domain: real behaviour in Sage? In other words, what should do to have (abs(cos(t))^2).simplify() return cos(t)^2? sage: maxima('domain: real;') real sage: var(t) t sage: assume(t, real) sage:

Re: [sage-support] Is there a way to factor an expression in terms of a set of variables?

On 01/06/13 13:46, Dillon wrote: Hello, I am working on using Sage to help solve a KCL analysis for a circuit. Sage is working great, I've managed to get it to produce the expressions I need. For future circuit analysis, it would be very helpful to be able to have Sage factor an

Re: [sage-support] piecewise

On 12/01/2012 09:34 AM, kcrisman wrote: On Friday, November 30, 2012 11:16:48 PM UTC-5, Michael Orlitzky wrote: On 11/30/2012 10:12 PM, Jason Grout wrote: Is there something better? I tried to get piecewise to work, but I couldn't plot, integrate, etc., the function

Re: [sage-support] piecewise

On 11/30/2012 10:12 PM, Jason Grout wrote: Is there something better? I tried to get piecewise to work, but I couldn't plot, integrate, etc., the function. I've collected a lot of code over the years for working with piecewise functions, but most of it was written before I knew anything

Re: [sage-support] Don't know a PDF representation for alpha in graphics?

On 11/15/12 12:12, john_perry_usm wrote: Hello I have created a nice graphic with some alpha. I try to save it. As a Sage object, I have no problem. The EPS representation doesn't preserve the alpha. The PNG does, but I'd prefer vector graphics. The PDF representation chokes on it. I get

Re: [sage-support] About collect-function

On 11/01/2012 03:58 AM, Jori Mantysalo wrote: For example (x^5 + x^2+ (5*a)*x^3).collect(x) returns x^5 + 5*a*x^3 + x^2 as I expected, but (x^5 + x^2+ (5*a)*x^3 + (10*a^2 + 6*a + 5)*x).collect(x) returns x^5 + 5*a*x^3 + (10*a^2 + 6*a + 5)*x + x^2 How to order polynomial as

Re: [sage-support] Re: Indexed variables/functions

On 11/01/2012 10:26 AM, Jason Grout wrote: Here's a conversation about this: https://groups.google.com/forum/?fromgroups=#!searchin/sage-support/Is$20there$20an$20efficient$20method$20of$20producing$20indexed$20variables?/sage-support/qj8q21wr7-0/Qs-Qxr8A0dAJ In particular, this is a nice

Re: [sage-support] obtaining coefficient matrix of a set of linear equations

On 09/09/2012 02:31 AM, akhil wrote: Hello, Given a set of m linear equations in n unknowns, how do I use SAGE to give me the coefficient matrix*A*(size m *n) and column vector *b*(size m*1) such that Ax = b; where *x*(size n*1) is the vector of unknowns ? It depends on how those

Re: [sage-support] how to factorize an expression with constant variables ?

On 09/03/12 03:26, mazkime wrote: Hello, I would like to factorize an expression with sage that contains constant variables (i.e. parameters), but I cannot figure out how to do that. Here is an example : x, y are variables and A is a parameter * var('A x y') f =

Re: [sage-support] how to factorize an expression with constant variables ?

On 09/03/12 14:49, mazkime wrote: Thank you for your answer and sorry for the typo mistake. Your solution works well with the example given but doesn't work as I would like with exponents (x^2, ...). Yeah it's not ideal. I needed to do this with symbolic derivatives, and the method I posted

Re: [sage-support] Possible error of function show when converting formulas to latex style

On 09/01/2012 12:25 PM, Joan C wrote: Hello, Don't know if this possible bug has been reported before, I was unable to find it: I use Sage Version 4.5, Release Date: 2010-07-16, with a Ubutu 10.x (Maverick). When I try to solve the next differential equation Sage

Re: [sage-support] Re: Latex tick labels in plot

On 06/01/12 13:26, ObsessiveMathsFreak wrote: The problem is that if the tick marks are too close together, the labels repeat themselves, or seem not to appear. It's very frustrating. For example try

Re: [sage-support] Unintuitive behavior of round()

On 05/13/2012 12:50 PM, Lorenzo wrote: u = sqrt(43203735824841025516773866131535024) We actually have a doctest confirming that it's awful =) This would probably be an easy project. Definition: u.round(self) Source: def round(self): Round this expression to the

Re: [sage-support] Re: Discrepancy in assumptions and assume

On 05/11/12 09:23, kcrisman wrote: I've updated the ticket with this. There is still some discussion there, a year old, about nested expressions... once again, the perfect has become the enemy of fixing at all. I haven't looked at this closely, but why not just open another ticket for the

Re: [sage-support] Compiling SAGE - Bizarre ZFS bug?

On 05/09/12 21:10, Kevin wrote: Linux dkar.research.pdx.edu 2.6.18-274.3.1.el5xen #1 SMP Tue Sep 6 20:57:11 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux cp -p ../include/NTL/*.h /n/oregano.cic.pdx.edu/export/vol-apps/apps-linux-x86_64/user/src/sage-4.8/local/include/NTL cp: preserving

[sage-support] Adding constants to the legend

Is there a smarter way to add (un-plotted) constants to the legend? Right now I'm just plotting them with linestyle=None. -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more

Re: [sage-support] Error in integrate

On 04/14/2012 12:04 PM, Laurent Decreusefond wrote: Dear all, here is my problem sage: var('t') t sage: integrate(e^(-2*t)/sqrt(1-e^(-2*t)),t,0,infinity) -1 ... a negative value for the integral of a positive function. This is a bug in upstream Maxima. I've opened a sage ticket

Re: [sage-support] Re: How to substitute a list of equalities into a formula?

On 04/09/12 22:18, ancienthart wrote: Hah. Thanks Michael and P. I first learnt Python in the 1.5 era, so there's a few of the nice new syntax features I'm still not up to speed on. Any reason why .subs doesn't accept multiple arguments? Would there be any point in requesting .subs_expr become

Re: [sage-support] Suppress print from R.inject_variables()

On 04/10/2012 08:00 PM, diophan wrote: I am writing a program that has a big loop that increases the adjusts the variables in a polynomial ring each time. However each time I create the polynomial ring with the following: R = PolynomialRing(GF(p),strvars) R.inject_variables() Where

Re: [sage-support] Re: How to substitute a list of equalities into a formula?

On 04/08/2012 03:33 AM, P Purkayastha wrote: Something like this? sage: solns = solve([f.diff(ar) for ar in f.args()],f.args(), solution_dict=True)[0] sage: f( *(solns[ar] for ar in f.args()) ) 0 The `subs_expr` method accepts multiple equations already, so you can shave a few characters

Re: [sage-support] Keeping coefficients as floats when using solve

On 02/19/12 19:58, Mike wrote: When I run: x,y=var('x,y', domain=RR) solve(2.0*x+3.0*y==4.0, y) I get [y == -2/3*x + 4/3] but I would like to get [y == -0.666*x + 1.3] How can I do this? Wild guess: the float coefficients are coerced to QQ, because

Re: [sage-support] Keeping coefficients as floats when using solve

On 02/20/12 10:39, Michael Orlitzky wrote: For a workaround, someone recently showed me this. You would call `symbolic_approx` on your result. Whoops, you'll need this, too: from sage.symbolic.expression_conversions import Converter -- To post to this group, send email to sage-support

Re: [sage-support] Keeping coefficients as floats when using solve

On 02/20/12 11:35, Burcin Erocal wrote: Or you can do this: sage: t = -2/3*x + 4/3 sage: t._convert(RR) -0.667*x + 1.33 Where were you a few weeks ago? =) Would anyone be opposed to making this a visible method? -- To post to this group, send email to

[sage-support] Numerical approximation of symbolic coefficients

I've got these polynomials in two variables, `x`, and `u`. The polynomials are low degree (eight at the moment), but I'm working symbolically, so they print exactly: ..+ 314069483520)*sqrt(3) - 80295755776*x + 4831838208)/(1953125*x^63 - 73828125*x^61... All I would really like is to

Re: [sage-support] Re: reg SAGE

On 02/01/2012 02:05 PM, William Stein wrote: It is pretty amazing how incredibly non-newbie-friendly less and more are. We could change ipython or the docstring so it includes a hint at the end of the message, which would make it so we don't have to hack the pager (less), so at least the user

Re: [sage-support] Fwd: sagemath question re: implicit differentiation

-- Forwarded message -- From: storne...@mathisasport.comstorne...@mathisasport.com That's fine, but now I want to solve for dy/dx, so I try: sage: solve(equation2.diff(),diff(f(x),x,1)) /home/stornetta/sage-4.7.2/local/lib/python2.6/site-packages/IPython/iplib.py:2260:

Re: [sage-support] Issues with bessel function.

On 01/19/2012 05:57 PM, Eric Kangas wrote: I have worked with bessel functions before and haven't had a problem until now. Code: - r,p,z,ro,gro,g,k = var('r, p, z,ro,gro,g,k') g = 1; k = 1; ro = 1; gro = 1 def Psi(r,z): return lambda r,z: (r*bessel_J(1, g*r))/(ro*bessel_J(1, gro))*cos(k*z)

Re: [sage-support] Re: Simplifying log expressions

On 01/15/12 13:18, JamesHDavenport wrote: Thanks. Given that, here's the sagenb (4.7.2) version, showing the bug (wrong when t is negative real): sage: t=var('t') sage: f=(1/2)*log(2*t)+(1/2)*log(1/t) sage: f.full_simplify() 1/2*log(2) I created a ticket for this here:

Re: [sage-support] Re: Simplifying log expressions

On 01/13/2012 07:38 PM, JamesHDavenport wrote: Unfortunately, full_simplify has its own problems, notably with branch cuts. sage: f = (1/2)*log(2*t) + (1/2)*log(-t) sage: f.full_simplify() 1/2*log(2) In my session, I had the difference of two logarithms. In yours above, you've got the sum. Is

Re: [sage-support] Simplifying log expressions

On 01/12/12 17:16, Tom Judson wrote: I would like to simplify the difference of two log expressions to show that I get a constant, but simplify((1/2)*log(2*t) - (1/2)*log(t)) just returns the expression. Does anyone know of an easy fix for this? Preferably, I would like something that

Re: [sage-support] Re: Problems with rank and HasseDiagram

On 01/11/2012 03:25 PM, Raymond N. Greenwell wrote: Adding format='adjacency_matrix') doesn't change anything. I still don't understand why the rank function isn't working on this Hasse diagram and how to make it work. It works fine in the example on the page I quoted. I disagree about the

Re: [sage-support] Re: Solving differential equations with unit_step?

On 01/10/2012 06:33 PM, achrzesz wrote: On Jan 9, 6:39 pm, Renan Birck Pinheirorenan.ee.u...@gmail.com wrote: Hi, I'm trying to solve a differential equation with unit step, e.g. the equation y'(x) = U(x-5) - where U is the unit step, and the inicial condition y(0) is 0. The result is 0 for

Re: [sage-support] Problems with rank and HasseDiagram

On 01/10/2012 11:37 AM, Raymond N. Greenwell wrote: Hello everyone! I tried using the HasseDiagram and rank features of Sage as described on http://www.sagemath.org/doc/reference/sage/combinat/posets/hasse_diagram.html Things worked ok, but when I then tried: m=

Re: [sage-support] Problems with rank and HasseDiagram

On 01/10/2012 09:17 PM, Michael Orlitzky wrote: We could do a lot better here -- I had to read the source for DiGraph.__init__ -- but it looks like when you called DiGraph(m), it considered 'm' to be an adjacency matrix. Or maybe I'm just bad at looking. DiGraph() is actually fairly well

Re: [sage-support] coeffs cannot handle a general function

On 01/03/2012 10:48 AM, Yi Wang wrote: Hi, I found coeffs does not work with a general function. It would be of great help for me to have it fixed. Thank you! I created a ticket for this, http://trac.sagemath.org/sage_trac/ticket/12255 You should be able to CC yourself and be notified of

Re: [sage-support] problem evaluating integral

On 12/10/2011 06:56 PM, andres.ordonez wrote: Hi, I'm having trouble evaluating this integral integral( x / (exp(x) - 1) , (x,0,oo)).n() I get TypeError: cannot evaluate symbolic expression numerically The answer (according to mathematica) should be pi^2 / 6 Is something wrong with my code?

Re: [sage-support] Dependence set of a symbolic expression

On 12/01/2011 10:46 AM, Santanu Sarkar wrote: Hello, Let S be a symbolic expression of a certain number of variables taken from a particular set of variables. How do I find out the list of the distinct variables that S depends on? Suppose {x0,x1,x2,x3,x4,x5,x6,x7,x8,x9} is a set of unknowns

Re: [sage-support] Re: Emacs support for visiting spkg files?

On 11/14/11 17:41, Ivan Andrus wrote: On Nov 14, 2011, at 8:09 PM, Michael Orlitzky wrote: On 11/14/11 08:34, Keshav Kini wrote: Will this work for uncompressed SPKGs too? Not without modification. If you can't rely on the extension to tell you what's in the file, you'll have to use

Re: [sage-support] Re: Emacs support for visiting spkg files?

On 11/14/11 08:34, Keshav Kini wrote: Will this work for uncompressed SPKGs too? Not without modification. If you can't rely on the extension to tell you what's in the file, you'll have to use something else. -- To post to this group, send email to sage-support@googlegroups.com To

Re: [sage-support] Apparent bug with evaluating an indefinite integral

On 11/12/2011 03:39 PM, William Stein wrote: I wonder if Sage should not call Maxima for definite integrals -- only call Maxima for finding a primitive, then do the rest itself? Here's a version of the integrate function that does what I'm speculating about: def integrate2(f, x, a, b):

Re: [sage-support] Re: Emacs support for visiting spkg files?

On 11/12/2011 08:47 PM, Bill Janssen wrote: You can visit a .tar.bz2 file with GNU Emacs 23, and it works. If I rename the .spkg file to .tar.bz2, it works. But I don't see how to tell Emacs that .spkg == .tar.bz2... John beat me to it, but this works in your .emacs file. ;; We have to

[sage-support] Symbolic integration problem

I take it this is failing because Maxima can't determine that my upper bound is real. Is there some way to make it do what I want? sage: B0 = SR.symbol('B0', domain='real') sage: B1 = SR.symbol('B1', domain='real') sage: B2 = SR.symbol('B2', domain='real') sage: B3 = SR.symbol('B3',

[sage-support] Simplify an expression containing a derivative

I pulled an expression out of a piecewise function that contains some derivatives. The full_simplify() method seems unhappy; can anyone decipher this error or think up a workaround? sage: load('recovery.py') sage: r = ZZ(3) sage: t = SR.symbol('t', domain='real') sage: x = SR.symbol('x',

[sage-support] Symbolic lagrange polynomials

I'm trying to compute the lagrange polynomial in 't' through three points containing 'x' terms. 1. It's hell =) but there's sort-of a trac ticket for that already[1]. The example given doesn't work when the data contain other symbolic values. I ultimately had to get the coefficients and

Re: [sage-support] Symbolic lagrange polynomials

On 09/12/11 10:02, Michael Orlitzky wrote: (p1 - p2).full_simplify() 0 p1.coefficient(t, 2) 1/4*(2*x - sqrt(2))^2 p2.coefficient(t, 2) 0 Disregard that, coefficient() does not work how I thought it did. -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe

Re: [sage-support] Re: psi function.

On 07/13/2011 04:29 PM, robin wrote: Hello Michael thanks for this. Mathematica allows you to specify the metric by which you measure simplicity (actually, it's called ComplexityFunction and IIRC there are five or six builtins). As for sage, how about just counting the number of calls

Re: [sage-support] Re: psi function.

On 07/12/11 22:07, robin wrote: Hi again [replying to self] I didn't make myself clear here. What I meant to ask was, I think, Look, sage doesn't seem to know this fact about psi(). Does sage store a list of known facts about the psi function anywhere? Because, if it does, I would

  1   2   >