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i have typed some code in matlab to find the 5 point fft of cos function of frequency 100hz but in answer i am not geting the answer at 100 hz.may i know where the things going wrong. the code is as this one

clc;

t=0:1/4:1;

x=cos(2*pi*100*t);

xm=abs(fft(x));

disp(xm)

p=0:length(xm)-1;

subplot(2,2,1);

stem(100*p,xm);

the answer is

5 0 0 0 0

thanks in advance