How do I access data within a cell?

Question

Franchesca 2014-4-21

编辑： Walter Roberson 2014-4-21

I have a variable which contains all the data within each cell, so you have to double click to open each matrix of data.

I want to count the number of zeros in the fifth column of the matrix. This is the code I have so far:

numberOfZeros = numel(mydata{7,1}) - nnz(mydata{7,1},{,:5});

It works when I didn't have the {,:5} but counted the number of zeroes in the whole matrix how do I define just column 5?

Answer 1

Walter Roberson 2014-4-21

编辑：Walter Roberson 2014-4-21

You have an extra comma, and one set of brackets of the wrong type, and wrong notation for column 5.

size(mydata{7,1},1)) - nnz(mydata{7,1}(:,5))

size(Array,1) asks for the number of rows in the array, and number of rows is going to be the same as the number of items that are in column 5.

But I would suggest

T = mydata{7,1)(:,5);
numberOfZeros = length(T) - nnz(T);