On Apr 9, 10:23 pm, nkulmati <[email protected]> wrote:
> Hi All, I am a newbie to Sage. My main purpose is to write scripts
> (algorithms). That is, I am not interested in the "answer-question"
> approach of the notebook, but I want to write and execute ".sage"
> files using sage just as I do with ".m" files using Matlab, for
> example.
>
> So I found this page:http://www.sagemath.org/doc/tutorial/programming.html
>
> However, when I use "load test.sage", everything works (variables get
> created and computed) but there is no output like the one I get by
> entering my algorithm line-by-line directly.
>
> For example, the command "G.plot()" gets totally ignored by the "load'
> function.
>
"load" is not ignoring "G.plot()". The function is actually executed,
but the return value is lost. It can be assigned to a variable with:
my_plot_object = G.plot()
There's a couple of things you can do to see your output.
In the case of "G.plot()", that function returns a graphics object. To
save your plot as an image, you can do something such as:
G.plot.save("my_plot.png")
See: [http://www.sagemath.org/doc/reference/sage/plot/
plot.html#sage.plot.plot.Graphics.save]
for more information.
In the Sage notebook, if "G.plot()" is not the last line of a cell,
the return value is similarly thrown away. In the notebook,
additionally, the output can be directly shown with:
G.plot().show()
See: [http://www.sagemath.org/doc/reference/sage/plot/
plot.html#sage.plot.plot.Graphics.show]
for more information.
If you want to output some line of text, you'll need to use the print
statement. If "my_result" is the variable containing the result of
your computation, you can use:
print my_result
Same story for the notebook as explained above.
> How can I use sage to run scripts that involve real-time plotting and
> other output?
I'm not sure what you mean by this. You can try looking at the
@interact decorator in the Sage notebook.
As an unrelated side note, you can also run sage scripts directly from
the command line with:
sage my_sage_script.sage
This will work if you add your sage installation directory to your
$PATH variable. See "sage --help" for more info.
Hope this answers some of your questions.
-- Kelvin
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