numerical_integral throwing an error

numerical_integral

asked 2013-09-23 21:24:38 +0100

Anonymous

Hi.

Can anyone explin why the following is producing an error please. First integral works, the second fails.

g(x) = 2*x

print numerical_integral(g, 1, 2)

(3.0, 3.3306690738754696e-14)

h(x) = x

print numerical_integral(h, 1, 2)

Traceback (most recent call last):

ValueError: free variable: x |--> x

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answered 2020-02-27 17:07:12 +0100

Karn3003
11 ●1 ●1

If we use h(x) instead of h in expression it is working fine.

print numerical_integral(h(x), 1, 2)

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answered 2013-09-23 22:01:11 +0100

kcrisman
12242 ●42 ●136 ●255

Ironically, h(x) = x is too simple. See Trac 15219.

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Of course, the workaround is just to do `numerical_integral(x, 1, 2)`. But we can fix this!

kcrisman ( 2013-09-23 22:01:33 +0100 )edit

The following also fails, presumably for the same reason. i(x) = 1*x print numerical_integral(i, 1, 2)

piper ( 2013-09-23 22:33:37 +0100 )edit

Correct, since internally Sage/Ginac makes 1*x = x.

kcrisman ( 2013-09-24 09:59:00 +0100 )edit

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