Help Please! I'm plotting curve for (7,4) hamming code.

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I'm doing (7,4) hamming code can anybody tell me where I'm doing mistake for that I'm unable to get plot for this code? And how can I do convolutional performance in this code?

close all, clc, clear all; 
num_bits = 8;
p = 0:0.0001:0.1
for a = 1:length(p);
genmat = hammgen(3)
n = 7; % Codeword length
k = 4; % Message length
data = randi([0 1],1,num_bits) % Random matrix
encData = encode(data,n,k,'hamming/binary')
nz = bsc(data,p(a))
data(4) = ~data(4)
decData = decode(encData,n,k,'hamming/binary')
numerrs(:,1) = biterr(data,decData)
ber = numerrs/num_bits
end 
plot(p,ber,'g--o')
xlim([0 0.1]) 
ylim([0.0001 1])
legend('hamming (7,4)')
xlabel('p crossover probability for the bsc')
ylabel('Probability of error')
title('19TL49')
grid on