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How plot methods?

asked 2020-12-07 06:04:50 -0600

Andr gravatar image

I use

r = 1.1
r.eint().n(digits=10)

output 2.167378280

But

plot(x.eint(), x, [-1,1],frame=True)

causes error: AttributeError: 'sage.symbolic.expression.Expression' object has no attribute 'eint'

How can I plot also functions defined as methods?

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answered 2020-12-07 06:11:40 -0600

tmonteil gravatar image

updated 2020-12-07 06:15:43 -0600

The problem is that x is a symbolic expression, and it does not have a eint method. So, instead of plotting a smybolic expression, you should try to plot a Python function:

sage: def eint(x): 
....:     return RR(x).eint()

Now, you can plot this function:

sage: plot(eint, [-1,1], frame=True)

Note that i had to transform x as an element of RR, because the plot function iterates over some elements of [-1,1] viewed as Pyhon floats which do not have a eint method either:

sage: float(1.1).eint()
AttributeError: 'float' object has no attribute 'eint'

You can see what happens if we omit to convert the float elements into RR:

sage: def eint_noconvert(x): 
....:     return x.eint() 

sage: plot(eint_noconvert, [-1,1], frame=True)
AttributeError: 'float' object has no attribute 'eint'
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Asked: 2020-12-07 06:04:50 -0600

Seen: 54 times

Last updated: Dec 07 '20