average and standard deviation of one column of a matrix

I want to calcualte the average and standard deviation for one column of a 1000x10 matrix.

Is there a quicker/efficient way or should I use existing code :

theSum = 0;
for k = 1 : length(x)
  theSum = theSum + x(k);
end
theMean = theSum / length(x);

Answer 1

[per isakson]

See

• std - Standard deviation
• mean - Average or mean value of array

[altaf ahmed]

Few more question as it was not clear to me hence asking - My data in the matrix is delay values, so can these std and mean commands be operated on an entire matrix of 1000x10 i.e. result is obtained based on all columns rather than just one?

2- Also is there a way to build up histogram data based on this matrix, e.g. below:

2a- number of occurences for minimum value, maximum value and average value

2b- how to obtain 90 percentile from this data (i.e., the delay that is surpassed by at most 10% of the occurences)

[per isakson]

"result is obtained based on all columns rather than just one? " Yes

X = rand(5);
mean(X(:)), std(X(:))

"2a- number of occurences for ..." The values of the "matrix of 1000x10" are they whole numbers?

"2b- how to obtain 90 percentile" see prctile Percentiles of a data set