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I know this is an old question, but in case anyone needs to do this...

You have to write a text file of inputs, which have on each line what you would enter into the command prompt. Then run that file with the shell command into XFoil.

I ran this first:

Code:

fid = fopen('XFoil_inputs.dat', 'wt');

fprintf(fid,['naca ' airfoil '\r']); % load this profile

fprintf(fid,'ppar\r'); % enter panelling parameters menu

fprintf(fid,['n 280\r']); % change the number of panels from 140 (default) to 280 (maximum)

fprintf(fid,'\r'); % carriage return

fprintf(fid,'\r'); % carriage return

fprintf(fid,'gdes\r'); % enter the geometry design menu

fprintf(fid,'flap\r'); % create a flap

...

...to generate a file with these contents:

Code:

naca 23012

ppar

n 280





gdes

flap

...

Then from Matlab execute !XFoil.exe<XFoil_inputs.dat, or whatever your filenames may be.