Hi Professor,

I would like to know if there is matrix A=1000*50;

for each colum:

I want to first detrend and then calculate the variance for each 10 numbers, ie. var(detrend(1th:10th), var(detrend(11th:20th)…var(detrend(991th:1000th),

then take the average of these 100 variances.

finally I want to do the same for the rest 49 colums and present the results for all 50 colums in a row.

Please could you provide me with the matlab loops functions?