index exceed matrix dimension error

Hi I have this function:

function f = zerocrossmap(blocks);

% This counts the zero cross count for each block % and returns a vector of those values.

len = length(blocks); n = sum(size(blocks)) - len;

f = zeros(n,1);

for i = 1:n f(i) = zerocross(blocks(i,1:len)); end

and function:

function f = block(v, N, M)

% This function separates the vector % into blocks. Each block has size N. % and consecutive blocks differ in % their starting positions by M % % Typically % N = 30 msec (600 samples) % M = 10 msec (200 samples)

n = length(v); maxblockstart = n - N + 1; lastblockstart = maxblockstart - mod(maxblockstart-1 , M);

% Remove the semicolon to see the number of blocks % numblocks = (lastblockstart-1)/M + 1 numblocks = (lastblockstart-1)/M + 1

f = zeros(numblocks,N);

for i = 1:numblocks for j = 1:N f(i,j) = v((i-1)*M+j); end end

so, when I run the funcion like this:

v=wavread('S1M1T01.wav'); N=30; M=10; bl=block(v,N,M) vector=bl; zrcr=zerocross(vector); blocks=bl; z=zerocrossmap(blocks);

I got an error:

Index exceeds matrix dimensions.

Error in zerocrossmap (line 12) f(i) = zerocross(blocks(i,1:len));

Error in block02 (line 8) z=zerocrossmap(blocks);

How to solve this problem?

Thanks a lot

[Image Analyst]

http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

Answer 1

[Image Analyst]

If len is not 1, then blocks(i,1:len) is a vector of number. Now I don't know what zerocross() is but if it's a array or a function that returns more than 1 number, you can't put it into f(i) because f(i) is just one element - the ith - not a range of elements. For example, you can't stick 10 numbers into a single element (unless it's a cell array, which it's not).