why i receive Nan for integral -inf to -inf ?

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xosro
xosro 2017-7-21
回答： Steven Lord 2017-7-21
for example:
if true
integral(@(x)exp(-(x.^2)/2),-inf,-inf)
end

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Richard Marveldoss
Richard Marveldoss 2017-7-21
The integral from -inf to -inf over exp(-(x.^2)/2) is the same as calculating the area of the rectangle bounded by -inf and -inf with a height e(-(x.^2)/2) evaluated at -inf(which is 0).The difference between -infs will return an NaN in MATLAB . The NaN times the height(0) results in NaN as well. The documentation link for properties of NaN : https://www.mathworks.com/help/matlab/ref/nan.html

更多回答（1 个）

Steven Lord
Steven Lord 2017-7-21
For computing that integral, you probably want to use the erf and/or erfc functions.

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