#### rntsay

##### Member level 4

**matlab derivative**

little matlab demo of fractional derivative..enjoy

N=256;

t=pi*[-N:N-1]/N;

f=exp(-(t.^2)/(0.5));

f=f-mean(f);

F=fftshift(fft(f));

figure(1);clf;set(gcf,'Renderer','zbuffer');

for n=0:0.1:4

Fn=(j*t).^n .* F;

fn=ifft(fftshift(Fn));fn=fn/max(abs(fn));plot(real(fn));

text(20,1.0,sprintf('%0.2f',n));

grid on;axis( [0 2*N -1.2 1.2]);

axis square;drawnow;

end;

creatively acquired from :

http://www.cs.dartmouth.edu/~farid/research/fracderiv.html