Error Using Accumarray "Requested array exceeds the maximum possible variable size"

I am trying to generate a histogram but I keep on getting this error

Error using accumarray

Requested array exceeds the maximum possible variable size.

Error in Analyze (line 170)

zm=accumarray([Dfr' Zfr'],1,[nn nn]);

My code is here

n=100;
for i=1:1
ZZ=Zf{i};
DD=Df{i};
nn=repelem(n,144);
Zf2=linspace(min(ZZ(:)),max(ZZ(:)),n);
Df2=linspace(min(DD(:)),max(DD(:)),n);
Zfr=interp1(Zf2,1:numel(Zf2),ZZ,'nearest');
Dfr=interp1(Df2,1:numel(Df2),DD,'nearest');
zm=accumarray([Dfr' Zfr'],1,[nn nn]);
figure, surf(zm);
hold on
end

A segment of Df and Zf are pictured above

Answer 1

[Walter Roberson]

nn=repelem(n,144);

That is a vector of 144 copies of 100

[nn nn]

that puts two of those together, getting a 1 x 288 vector of 100's.

You are requesting that accumarray create an output that is 100^288 elements.

https://www.popularmechanics.com/space/a27259/how-many-particles-are-in-the-entire-universe/

There are only roughly 3*10^80 particles in the observable universe.

[Andrew Stark]

Thank you that makes sense! Is there a better way to format this then in order to allow the histogram to be generated?

[Walter Roberson]

zm=accumarray([Dfr' Zfr'],1,[n n]);

[Andrew Stark]

That yields the error

Error using accumarray

Third input SZ must be a full row vector with one element for each column of SUBS.

[Walter Roberson]

zm=accumarray([Dfr Zfr],1,[n n]);