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Error Handling

asked 2022-01-30 20:06:57 +0200

Rune gravatar image

I am very new to Sage, so apologies if the answer to this question is obvious.

I have a program, and at the final calculation, for T and E matrices calculated earlier, it needs to either calculate a matrix A such that T=AE, or, if this returns an error message, calculate a matrix A such that p*T=AE, where p is also calculated earlier.

In mock code, what I mean is:

Calculate E.solve_left(T)
If that returns an error:
      A=E.solve_left(p*T)
else:
      A=E.solve_left(T)
return A

But I don't know how to do that in real code.

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answered 2022-01-30 20:16:03 +0200

Max Alekseyev gravatar image

updated 2022-01-31 18:32:38 +0200

You need to handle an exception (this is Python feature inherited in Sage):

try:
    A=E.solve_left(T)
except:
    A=E.solve_left(p*T)
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Comments

Or simply:

try:
    A = E.solve_left(T)
except:
    A = E.solve_left(p*T)

Note that it is better to name the exception you expect to catch (for example except ValueError) to avoid catching unexpected errors.

Sébastien gravatar imageSébastien ( 2022-01-31 17:51:47 +0200 )edit

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Asked: 2022-01-30 20:06:57 +0200

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Last updated: Jan 31