Undefined function 'vrxmf1' for input arguments of type 'double'. Error in newton>fit_fun (line 435) fprintf(fi​d1,'%10.6f​\t%10.6f\t​%10.6f\t%7​.4e\t%10.6​f\t%10.6f\​t\n',.....​.

rowmx=1000;
vrxmf=zeros(rowmx,6);  
nrow=1;          %...............printing in to file.............
for n1=1:nrow-1;
fid1=fopen('C:\Users\hp\Documents\MATLAB\ss1.dat');
fopen(fid1);
fprintf(fid1,'%10.6f\t%10.6f\t%10.6f\t%7.4e\t%10.6f\t%10.6f\t\n',......
 vrxmf1(n1,1),vrxmf1(n1,2), vrxmf1(n1,3), vrxmf1(n1,4), vrxmf1(n1,5),vrxmf1(n1,6));