How to install latest sage version on window 7 + Question following the online sage tutorial guide

[leu...@gene.com]

Hi, 

Q1: Can anyone tell me how to install the latest sage on window 7?  I am using virtual box with sage 5.1.3  This is the latest version posted on the sage math website link for window installation.  If I want to use the 6.1.1, what can I do?  I have only used window with no programming experience. 

Q2: I tried to follow the online sage tutorial (http://www.sagemath.org/doc/tutorial/tour_algebra.html).  The session of using maxima to do laplace transform.  I copied the exact command

de1 = maxima("2*diff(x(t),t, 2) + 6*x(t) - 2*y(t)")
lde1 = de1.laplace("t","s"); lde1

but it does not work in my 5.1.3 virtual box version. Why is that? See the attach jpg for the error.  I cannot find where is my syntax error.  I tried to define s and t as variable first but it does not help either.  I do not know what syntax error I made....

error message:

Traceback (most recent call last):

   File "<stdin>", line 1, in <module>

   File "_sage_input_7.py", line 10, in <module>

      exec compile(u'open("__code__.py","w"),write("# -*- coding: utf-8 -*- ...................I skip typing the rest

   File "", line 1, in <module>

   File "/tmp/tmpQapKht/__code__.py", line 3

      del = maxima("2*diff(x(t),t,2)+6*x(t)-2*y(t)")

          ^

SyntaxError: invalid syntax

besides, where can I find a good source of learning sage besides the tutorial? I need a tutorial that explain the code line by line.  In particular, I want to learn the different ploting technique in sage, again with line by line explanation of syntax.  I tried google but nothing comes in systematically...

I read the unfinished sage for newbie book by Ted Kosan, which is very useful because he explained the syntax line by line.  Unfortunately he did not finish this book...

Thank you

[leif]

leu...@gene.com wrote:
> Q2: I tried to follow the online sage tutorial
> (http://www.sagemath.org/doc/tutorial/tour_algebra.html). The session
> of using maxima to do laplace transform. I copied the exact command
>
> de1 = maxima("2*diff(x(t),t, 2) + 6*x(t) - 2*y(t)")
> lde1 = de1.laplace("t","s"); lde1
>
>
> but it does not work in my 5.1.3 virtual box version. Why is that? See
> the attach jpg for the error. I cannot find where is my syntax error.
> I tried to define s and t as variable first but it does not help
> either. I do not know what syntax error I made....
>
> error message:
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "_sage_input_7.py", line 10, in <module>
> exec compile(u'open("__code__.py","w"),write("# -*- coding: utf-8
> -*- ...................I skip typing the rest
> File "", line 1, in <module>
>
> File "/tmp/tmpQapKht/__code__.py", line 3
> del = maxima("2*diff(x(t),t,2)+6*x(t)-2*y(t)")
> ^
> SyntaxError: invalid syntax

Well, 'del' is a Python keyword ("delete"), so renaming the variable to
something else will probably work.


-leif

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[leif]

P.S.: In the example you "copied", it's 'de1' (d--e--*one*), not 'del'.