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find the minimum value of y for positive vales of x

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i have xmin=min(y(x>0)); where x=[-100:100] & y =x^3+60x^2-50 it gives me -50 which is wrong
aloso i have xmin=min(y(0:x(end))); where x=[-100:100] & y =x^3+60x^2-50 it gives me -50 which is wrong answer
any ideas? is my expression wrong ?

  1 Comment

per isakson
per isakson on 3 Sep 2020
I fail to run the code snippets of your question

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Accepted Answer

per isakson
per isakson on 3 Sep 2020
Try this
%%
x = (-100:100);
y = x.^3+60*(x.^2)-50;
%%
xmin = min(y(x>0))
which returns
xmin =
11
>>

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