Summation of Array help!

I have an array and I'd like to sum up very specific data. Background info, the array is an image and I would like to display an image which is a summation of a few frames

my data is stored like such:

a = data{1}(:,:,1,:15) % This displays the first image in the 15th frame.

imagesc(1)

I would like to display the first image with a summation of the first to fourth frame but when I try I get errors

example:

sum(data{1}(:,:,1,1:4)); imagesc(a)

the error obtained is:

Error using image Indexed CData must be size [MxN], TrueColor CData must be size [MxNx3]

Error in imagesc (line 19) hh = image(varargin{1},'CDataMapping','scaled');

Error in Summation (line 5) imagesc(a)

What does this mean, and how can I fix it !?

Answer 1

[Matt J]

sum(data{1}(:,:,1,1:4)  ,4 );

[Hanif]

What purpose the the , 4 have? Please explain! Thank you!

[Matt J]

You're summing along the 4th dimension of your frame data.

[Hanif]

Thank you!