Create single columns of elementwise means

How would I compute the elementwise means of dark fields and flat fields, to get both a single dark field and a single flat field column to use in correction. I then need to apply the single dark mean and flat field mean for correcting the transmission data (X_proj).

X_dark = 2560x30 double

X_flat = 2560x200 double

X_proj = 2560x1500 double

My attempt for X_dark is below, does this look correct? How would I then apply it to correct the transmission data (X_proj)?

temp=zeros(2560,1);
for i=1:30
    temp=temp+X_dark(:,i);
end
X_dark_avg=temp./30;

[Stephen23]

"My attempt for X_dark is below, does this look correct?"

The MATLAB approach would be to avoid the loop and call mean with its optional dimension argument:

X_dark_avg = mean(X_dark,2)

[Ryan]

Thanks! How can the averaged single columns for X_dark_avg and X_flat_avg then be applied 1500 times for correcting the X_proj data?

[Jan]

@Ryan Philips: It depends on what "applying" means here. Please explain, which mathematical operation you want to perform.

Answer 1

[Matt J]

DF=mean(X_dark ,2);
FF=mean(X_flat ,2);

X_corrected=(X_proj-DF)./(FF-DF);

[Ryan]

Great, thanks! That code solution is working!