function - input and output matrix
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I need to write a function that takes a matrix of any size, double all the elements that are positive and adds 10 to all the elements that are zero or negative. I can't use loops, only filters.
the input matrix is xin[n,m] sent by the script and the out variable is xout [n,m]
This is my code:
function xout = matrixfx(xin)
%matrixfx takes a matrix of any size, doubles all the elements that are positive and adds 10 to all
%the elements that are zero or negative.
[n,m] = size(xin);
xout = zeros(n,m);
mask = xin > 0;
xout(mask) = xin(mask) * 2;
xout(~mask) = xin(~mask) + 10;
end
4 Commenti
Steven Lord
il 21 Giu 2021
Okay, can you show us that script? I have a suspicion about what's causing the error but I'd need to see that script to confirm or refute that suspicion.
Risposte (2)
Steven Lord
il 22 Giu 2021
My suspicion was correct. When you call load with an output argument, that output argument is a struct array with each variable in the MAT-file you load stored as a field of that struct. You just need to pull the data out of the struct.
mydata = load('census.mat')
If I wanted to work with the date and population data from census.mat, I would need to use mydata.cdate and mydata.pop rather than mydata (the whole struct array), cdate (which doesn't exist; the data is in the field of mydata), or pop (which also doesn't exist.)
[p, s, mu] = polyfit(mydata.cdate, mydata.pop, 2); % Work with cdate and pop from census.mat
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Jan
il 21 Giu 2021
Modificato: Jan
il 21 Giu 2021
Your code is fine. The only problem is, that you call it with a struct. Unfortunately you show us the code, but not, how you cll it, but the error is there.
x = [-10, 0, 10; -0.1, -1, 0];
matrixfx(x) % Working!
function xout = matrixfx(xin)
xout = zeros(size(xin));
mask = xin > 0;
xout(mask) = xin(mask) * 2;
xout(~mask) = xin(~mask) + 10;
end
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