MATLAB: To convert m by n matrix to 1 by n

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 I want to convert 127 by 4 matrix to 1 by 4 matrix such that each value in the output row equivalent to average of all values in that particular column.

Best Answer

If the 127x4 matrix is named A, then use

mean(A)

If you want to be more precise about which dimension it calculates the mean over, use mean 's second argument as well:

mean(A,1)

Related Solutions

MATLAB: Normalize matrix by standard deviation

If A is your MxN matrix and is of type 'double', do this:

   A = bsxfun(@rdivide,A,std(A));

(This assumes you want unbiased standard deviation.)

MATLAB: Plotting n-by-m matrix

Good question. I also faced this issue a few years ago, and I found the simplest solution was to append NaN onto the bottom of the matrices, e.g.:

X(end+1,:) = NaN;
Y(end+1,:) = NaN;
plot(X,Y,'-o')

This forces MATLAB to treat each column as its own "line", even if it contains only one data point, while the NaNs are of course not plotted (so you do not need a special case, the NaNs can be appended to matrices of any size). Here is an example with your data:

>> X = [1,1.1];
>> Y = [3,3.5];
>> X(end+1,:) = NaN;
>> Y(end+1,:) = NaN;
>> plot(X,Y,'-o')

Best Answer

Related Solutions

MATLAB: Normalize matrix by standard deviation

MATLAB: Plotting n-by-m matrix

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