# How to make specific elements in a 3D matrix zero?

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Rabia Zulfiqar on 22 May 2020
Commented: Rabia Zulfiqar on 23 May 2020
Hi I have a 3D matrix namely Costyearlydata having size of 24x365x10 and I want to make certain elements in that matrix zero.
D has a size of 4000x1x10 and it represents the index of those elements which should be zero.
I am trying with this code but the problem is it only gives correct results for the 1st layer in cost1 matrix and for the remaining nine layers it doesn't make that element zero .What is wrong with my code.Kindly point out my mistake.
for yy=1:10
cost1(:,:,yy)=Costyearlydata(:,:,yy);
cost1(D)=0;
end
Your assistance is much appreciated.I am not so much familiar to dealing with 3D matrix and I am quite new to MATLAB:(

Walter Roberson on 22 May 2020
D has a size of 4000x1x10 and it represents the index of those elements which should be zero.
The index relative to what? Relative to the 24 x 365 plane? The linear index in the 24 x 365 x 10 array?
Rabia Zulfiqar on 22 May 2020
yes it represents the index relative to 24x365 plane. For example in each layer I have 8760 elements. D is the linear index from 1 to 8760.
D has 10 layers so for each layer it has indexing from 1 to 8760.
Rabia Zulfiqar on 22 May 2020
I also tried this but this one is also giving incorrect answer.
for yy=1:10
cost1(:,:,yy)=Costyearlydata(:,:,yy);
cost1(D(:,:,yy))=0;
end
I don't know how to fix this issue:(

David Goodmanson on 23 May 2020
Hi Rabia, try
for yy=1:10
temp = Costyearlydata(:,:,yy);
temp(D(:,1,yy)) = 0;
cost1(:,:,yy) = temp;
end

#### 1 Comment

Rabia Zulfiqar on 23 May 2020
Thanks a ton David:):)