# For loop with if and elseif statements

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Santos García Rosado le 22 Mar 2021
I've been writting a code for some time now, and I endend up having quite a big matrix for loop with many statements. Now I want to modify that loop and some of it's statements, but I came up with some issues. First of all, I'd like to know if I coud write a new statement where I could ask the program to skip some iterations within the loop until a certain position on my matrix. For example, let's say I have an Input A(m,n) such as:
A = [2 0.5 1 2 0 -1 0 -1 6 4 3 0 ; 0 3 4 0.5 6 0 0 -1 0 0 -1 0];
What I expect from the code is to add the value of each position to the addition of the previous ones, except when the value is 0.5, that I'd like to hold the value until you come up with a -1, where I'd like to multiplyit by 2.
Expected Output:
Out = [2 2 2 2 2 4 4 8 14 18 21 21; 0 3 7 7 7 7 7 14 14 14 24 24]
Any help with this? Also, would it be interesting changing this part of the code from is and elseif statements to a switch case structure?
Thank's for the help,
Santos
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### Réponse acceptée

Matt J le 22 Mar 2021
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Matt J le 22 Mar 2021
AAA = [0 0.5 1 2 0 -1 0 -1 6 4 3 0 ; 0 3 4 0.5 6 0 0 -1 0 0 -1 0];
BBB = zeros(size(AAA));
% BBB(1,:) = AAA(1,:);
for f = 1:size(AAA,1)
holdState=0;
for c = 2:size(AAA,2)
if AAA(f,c) == 0.5 || (holdState && AAA(f,c)~=-1)
BBB(f,c) = BBB(f,c-1);
if AAA(f,c) == 0.5, holdState=1; end
elseif AAA(f,c) == -1
BBB(f,c) = BBB(f,c-1) * 2;
holdState=0;
else
BBB(f,c) = BBB(f,c-1) + AAA(f,c);
end
end
end
BBB
BBB = 2×12
0 0 0 0 0 0 0 0 6 10 13 13 0 3 7 7 7 7 7 14 14 14 28 28
Santos García Rosado le 22 Mar 2021
That solved it! Thank's for your time Matt!

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