Fast generation of text file

[wild.manul]

Hello

I need to write task for linear programming solver in text file from Octave.
The structure of text file is following:

a11 x1+ a12 x2+ a13 x3+ ... +a1n xn
....
an1 x1+ an2 x2+ an3 x3+ ... +ann xn

where a11, ..., ann are given coefficients. x1,...,xn are symbols x with
indexes. Coefficients and indexes are stored in matrix a:
a11 1 a12 2 a13 3 ... a1n n
....
an1 1 an2 2 an3 3 ... ann n
Problem is that matrix is rather huge - 2000x2000 elements and writing it to
text file is slow. 

I wrote the following code to do that:

for i:row do
 fprintf(fid,'%7.5f x%d+',a(i,:)); 
end

May be there is faster way how to do it?

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