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Calling the length of a list of inequality strings result in an error

asked 2022-03-29 11:24:34 +0200

Cyrille gravatar image

I wonder if this is a bug

sign=['>=', '<=', '=']
m1=[1 if (v=="<=" or v==">=") else 2 for v in sign]
m1

The len(m1) is defined but

y=var('y_',n=range(len(m1)))

return the error '>' not supported between instances of 'range' and 'int'

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Note that len(m1) will be the same as len(sign). Do you want the length of m1 or the number of distinct elements or the actual distinct elements? For the last of these, you could use var(['y_{}'.format(i) for i in set(m1)]).

John Palmieri gravatar imageJohn Palmieri ( 2022-03-29 19:16:38 +0200 )edit

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answered 2022-03-29 11:53:00 +0200

tmonteil gravatar image

The n option for SR.var is supposed to be an integer, not an iterator. Do you mean the following ?

sage: y = var('y_', n=len(m1))
sage: y
(y_0, y_1, y_2)
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Yes I am stupid

Cyrille gravatar imageCyrille ( 2022-03-29 22:45:36 +0200 )edit

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Asked: 2022-03-29 11:24:34 +0200

Seen: 32 times

Last updated: Mar 29