Help generating .coe file

i have written a matlab code to generate .coe file. unfortunately .coe file is generated containing nothing. below is my code:

clear all;

N = 255;

B = 2;

div = (N-1)/(N+1);

c = atanh(div);

filename = 'catan.coe';

fid = fopen(filename,'wt');

fprintf(fid,'memory_initialization_radix=2;\n');

fprintf(fid,'memory_initialization_vector=\n');

for i=0:N-1

    fprintf(fid,'%d,\n', c(i));

end

fprintf(fid,'%d;\n', c(N));

fclose(fid);

Please help me by rectifying the code to generate valid .coe file

Answer 1

[Walter Roberson]

In your loop, you have

for i=0:N-1
    fprintf(fid,'%d,\n', c(i));
end

Notice that this will start by attempting to access c(0) . Indexing at location 0 is not permitted in MATLAB, so your code would crash.

Your earlier line included

div = (N-1)/(N+1);

with N being a scalar value. div will then be a scalar value, so when you calculate c = atanh(div), c is going to be a scalar value. But then the loop I pointed out above is going to try to access N different locations in that scalar value c.

Your code is ill beyond the point we can reasonably guess what you want to do.

[debalina ghosh]

thank you sir, but if i write

for i = 1 : N-1

.

.

.

will it generate the .coe file with vali coefficients?

i want to generate arctanh coefficients followig the formula atanh((a-1)/(a+1)),where a = natural number,

so here i teke a as N = 255. now sir plz help me.

[Walter Roberson]

Perhaps you want

div = ((1:N)-1) ./ ((1:N)+1);

c = arctanh(div);

I do not know anything about .coe files, but there was a reference in another question, http://www.mathworks.com/matlabcentral/answers/1482-coe-file-in-matlab