Correctly outputting new assignments during each loop of a for-loop

Question

I want a new answer to be output every iteration of this for loop. Currently it is update the fluence to be just the last last loop output.

for i = 1:nx
    fluence= data1cm(i).data(:,3).*25000000.*(energygap);
    %dim=size(c)
    %'fluence' num2str((i)+1)= fluence;
end

It depends on what data1cm(i).data and energygap are. Please see minimal reproducible example. — Cris Luengo
– Cris Luengo, Commented Nov 6, 2018 at 13:37

Nicky Mattsson · Accepted Answer · 2018-11-06 13:41:07Z

2

Just as you index into data1cm(i) you can save the value into fluence in the same manner, e.g. if the result of data1cm(i).data(:,3).*25000000.*(energygap) is scalar you can do

for i = 1:nx
    fluence(i)= data1cm(i).data(:,3).*25000000.*(energygap);
end

Then fluence will be a 1*nx array of all the results.

For efficiency one should always initialise the variable, that is create it with some temporary values and then overwrite these values.

fluence = zeros(1,nx);
for i = 1:nx
    fluence(i)= data1cm(i).data(:,3).*25000000.*(energygap);
end

Here I initialise fluence with zeros, and then all of these zeros are overwritten by the result of data1cm(i).data(:,3).*25000000.*(energygap);. Other initialisations are e.g. ones and nan.

answered Nov 6, 2018 at 13:41

Nicky Mattsson

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