Using an array inside a function

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Ben Hendrickson 2021-2-12

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https://ww2.mathworks.cn/matlabcentral/answers/743977-using-an-array-inside-a-function

回答： Star Strider 2021-2-12

I have a spectral block (512,512,16) that can be thought of as the output from a multiband image sensor (16 spectral slices). I'd like to integrate over the slices to produce a single image (512,512). The integral includes a wavelength term, so I figured it'd be best to use a function handle, but I can't reason a way to operate on the entire block all at once. I could loop through pixel by pixel, but I'm sure there's a more clever way to go about this. Thoughts?

Thanks,

Ben

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Answer 1

Star Strider 2021-2-12

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/743977-using-an-array-inside-a-function#answer_622202

在 MATLAB Online 中打开

Try something like this, using trapz:

SB = randn(512,512,16);                             % Create Matrix
Lambda = 1./(1:16);                                 % Create Wavelength Vector (Guessing Here)
IntSB = trapz(Lambda,SB,3);                         % Numerical Integration Over Dimension #3

The result will be a (512,512) matrix.

Also consider cumtrapz, depending on the result you want.