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Doing calculation across columns

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Nick DeMarchis
Nick DeMarchis 2019-4-22
评论： Jenny Hall 2020-10-22
Hi there. I have a 4 column by 500 row matrix. How would I add a fifth column that calculates , where x is the corresponding value in the second column across the same row.
Thanks!

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采纳的回答

madhan ravi
madhan ravi 2019-4-22
D=zeros(500,5);
D=matrix;
D(:,5)=exp((-(matrix(:,2)-75)/2).^2)
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Stephen23
Stephen23 2020-10-22
编辑：Stephen23 2020-10-22
x(:,2) = (((6.64e-34)*(9.5e+9))./((9.274e-24)*(x(:,1)/10000)))
% ^^ you might want array division here
https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html
Jenny Hall
Jenny Hall 2020-10-22
Thank you! This worked a treat.

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JULIEN BARBAUD
JULIEN BARBAUD 2019-4-22
编辑：JULIEN BARBAUD 2019-4-22
I think that if you call your input matrix A, and the final result B, then this:
f=@(x) exp( (-(x-75)/2).^2 )
B=[A f(A(:,2))];
should do the trick
EDIT: oops, madhan was quicker

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