here is the answer to the first thing. use auto_update=False -
sage: @interact
... def _(A=matrix(QQ,3,3,range(9)), v=matrix(QQ,3,1,range(3)),
auto_update=False):
... try:
... x = A\v
... html('$$%s %s = %s$$'%(latex(A), latex(x), latex(v)))
... except:
... html('There is no solution to $$%s x=%s$$'%(latex(A),
latex(v)))
Rajeev
On Tue, May 18, 2010 at 1:50 PM, [email protected] <[email protected]> wrote:
> Dear support, this code is from interact help:
>
> sage: @interact
> ... def _(A=matrix(QQ,3,3,range(9)), v=matrix(QQ,3,1,range(3))):
> ... try:
> ... x = A\v
> ... html('$$%s %s = %s$$'%(latex(A), latex(x), latex(v)))
> ... except:
> ... html('There is no solution to $$%s x=%s$$'%(latex(A),
> latex(v)))
>
> If I want to change five numbers in the matrix A, I get a solution
> whenever I change each field.
> Is it possible to change all my five fields first and the let interact
> to compute the answer? In other words, interact should not do
> anything, unless asked explicitly.
>
> I was thinking about adding a checkbox and perform the computation
> only if the checkbox is on, but this gives another problem: how to
> uncheck the checkbox from Sage interact after computation is done.
>
> I am thinking about an interact which allows some comfortable
> manipulations with matrix rows and can be used for row pivoting,
> evaluating inverse functions, solving systems of linear equations and
> evaluating rank and determinants. For example, can be used on
> recitations. If something like this has been done, let me know,
> please. Many thanks
>
> Robert Marik
>
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