Oh , thanks a lot , will try very soon, indeed, wonderful ; thanks a lot, Opa Peter
Op dinsdag 11 mei 2021 om 22:55:56 UTC+2 schreef [email protected]: > The sympy.solvers.solveset.linear_eq_to_matrix is probably what you are > needing: > > ```python > >>> eqns = [c*x + z - 1 - c, y + z, x - y] > >>> A, b = linear_eq_to_matrix(eqns, [x, y, z]) > >>> A > Matrix([ > [c, 0, 1], > [0, 1, 1], > [1, -1, 0]]) > >>> b > Matrix([ > [c + 1], > [ 0], > [ 0]]) > ``` > > On Tuesday, May 11, 2021 at 12:54:49 PM UTC-5 [email protected] wrote: > >> Got adain interested in a book LINEAR ALGEBRA with APLICATIONS, very >> nice book, very early there are exercises to show the corresponding matrix >> of coeffients. Trivial, if one types by reading the ckeeficients to bild >> the riws Matrix needs. But now my question : How to generate thebmatrix by >> a def .... >> ok lhs and rhs of an Eq is easy, using args too . But what dimyoundo if >> there are equations with differen numbers of say x_i. Missing unknows have >> to create an 0 at the needed row.index. >> I translated an equation (lhs) with srepr with regular expression , >> replacing Symbol ('x1) to 1 etc . >> >> Questions , how would you trans form e.g x1 + x3 - 2*x5 To >> 1 0 1 0 -2 ? >> >> Ok, I extract x1 x3 and x5 ==>!knowing now x2 and x4 is missing, knowing >> the 0 at index 1 and 3 (zero order of Python) ... >> >> Have to learn to give code examples here ... Pictutes ? >> Newbie in this groep >> >> Ideas and help very much apteciated 😉 , by the way i am an 祖父 is >> grandpa >> >> -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/2ac5943d-ffd6-4d59-b547-8e0b923bc0e9n%40googlegroups.com.
