Thanks Andrey and kcrisman for the replies!
On Thursday, February 19, 2015 at 4:05:25 PM UTC-5, Andrey Novoseltsev
wrote:
>
> On Thursday, 19 February 2015 12:17:24 UTC-7, kcrisman wrote:
>>
>>
>>> f.write(old_heading + g.read())
>>> exceptions.UnicodeDecodeError: 'ascii' codec can't decode byte
>>> 0xc2 in position 5454: ordinal not in range(128)
>>>
>>> Any help would be appreciated.
>>>
>>
>> I would recommend looking at what happens when you do them - which
>> worksheet seems to trigger this? My guess is there is some unusual
>> character, see for instance
>>
>> http://stackoverflow.com/questions/16508539/unicodedecodeerror-ascii-codec-cant-decode-byte-0xc2
>> or
>> http://blog.webforefront.com/archives/2011/02/python_ascii_co.html
>> for some details - maybe it even is the same character in question. I
>> guess we need to ask this to be written with utf-8 or something. Andrey,
>> any suggestions?
>>
>
I thought of that, when I saw the error. There was only one worksheet with
a weird name (which I had imported from someone). I tried changing the
name, but it did not work.
>
> Well, my guess is that there are some worksheet titles with non-Latin
> characters. Luis - do you have any? Can you try to download them separately
> and in a small group? (Separately meaning a single one into sws file, and a
> group means two or more that should be packed into an archive.) I am not
> sure where exactly encoding commands should be added, but to start with we
> need a reproducible behaviour.
>
OK, so I went over all worksheets, deleting a bunch I did not need anymore,
and then tried each worksheet individually. I found out that I had two
worksheets causing the problem, i.e., I could not download them
individually or whenever they were in a group. They were both imported,
i.e., I saw them somewhere (sorry, can't remember where), liked, downloaded
and imported. Both run fine, by the way.
One is "Newton's Method". It is short, and I could not spot any weird
characters *after I changed its name*. (This is the one that had a strange
name, but I think not UTF-8 characters. It had simply things like & and
'). Here is its content:
{{{id=0|
%hide
html("<h2>Newton's Method</h2>")
html("Here you can experiment with how Newton's Method approximates the
zeros of a function.")
html("<ul><li>Modify <i>f</i> for the function whose zero you want.</li>")
html("<li>Modify <i>Number of steps</i> for the number of steps the method
should take (1—5, default 2).</li>")
html("<li>Modify <i>x</i><sub>0</sub> for the starting
<i>x</i>-value.</li></ul>")
html("If 5 steps is not enough, change the starting value to the last
approximation.<p>")
html("The default setup provides an example using ")
html("<i>x</i><sup>3</sup> + 0.4 <i>x</i><sup>2</sup> - 0.51 <i>x</i> -
0.16")
html("<br>")
var('x')
@interact
def squeezers(f=input_box(default=x^3+0.4*x^2-0.51*x-0.16), num_approx=
slider(1,5,default=2,step_size=1,label="Number of steps"), xstart=input_box(
label="<i>x</i><sub>0</sub>",default=2), xm=input_box(label=
"<i>x</i><sub>min</sub>",default=0), xM=input_box(label=
"<i>x</i><sub>max</sub>",default=2),roundto=input_box(label="Round answers
to how many digits? (0: don't round)",default=4)):
if (roundto!=0):
xprev = round(xstart,roundto)
else:
xprev = xstart
df = diff(f)
displayplot = plot(f,xm,xM,rgbcolor='black',thickness=2)
#ym = displayplot.ymin()
#yM = displayplot.ymax()
for each in range(num_approx):
if (df(x=xprev) != 0):
xnext = -f(x=xprev)/df(x=xprev)+xprev
displayplot = displayplot + line([[xprev,0],[xprev,f(x=xprev)]],
linestyle='--')
displayplot = displayplot + plot(df(x=xprev)*(x-xprev)+f(x=xprev
),xprev,xnext)
displayplot = displayplot + point((xnext,0),pointsize=20)
xprev = xnext
else:
displayplot = displayplot + line([[xm,f(x=xprev)],[xM,f(x=xprev
)]],linestyle='--')
if (df(x=xprev) != 0):
if (roundto!=0):
html("Approximation is " + (str(round(xprev,roundto)).rstrip('0'
)))
else:
html("Approximation is " + (str(xprev).rstrip('0')))
displayplot = displayplot + point((xprev,0),pointsize=30,rgbcolor=
'red')
else:
html("Unable to complete, due to horizontal tangent line.")
#displayplot.show(xmin=xm,xmax=xM,ymin=ym,ymax=yM)
displayplot.show(xmin=xm,xmax=xM)
///
}}}
{{{id=1|
///
}}}
The other is very long is called "Grand Tour" (and at the top has "The Sage
Library -- a Grand Tour, June 2009". It is too long for me to search for
characters "manually".
I can live without them, so I am happy enough, but anyone is interested in
finding exactly what went wrong, I'd be glad to help.
Thanks for the help!
Luis
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