The problem is only with the round(, 2) code
f(x)=round((1/add([10, 20 ,30]))*x,2)
percent_votes_cand=list(map(f,[10, 20 ,30]))
percent_votes_cand
This gives an error since round() couldn't be applied to a theoretical argument. The following code works but I want to obtain truncated to 2 digits percentages not elements of Q
You should not use a symbolic function for such purpose, symbolic functions should be understood as mathematical expressions, they are usefull if you want to view them as a mathematical object, for example if you want to derivate them.
Instead use a Python function, which is an object that returns a value given an entry.
There are two equivalent ways to define a Python function:
sage: def f(x):
....: return round(1/add([10,20,30]) * x, 2)
Or, the shorter
sage: f = lambda x : round(1/sum([10,20,30]) * x, 2)
In both cases, you can do:
sage: percent_votes_cand=list(map(f,[10, 20 ,30]))
sage: percent_votes_cand
[0.17, 0.33, 0.5]
Asked: 2021-01-15 15:11:13 +0100
Seen: 151 times
Last updated: Jan 18 '21
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Can you say what result you get and what result you would prefer to get?
Slelievre, I have corrected my question.