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Determining index of range of values in a matrix


Hi All,
I am using python for doing the following:
I have a matrix which has dimension of 174*993.
Each row of the matrix has some numbers in the range of 30-30.5.
I would like to determine the index of the numbers in the range of 30-30.5 in each row.
I can determine the index of the numbers in each row by using result1=np.where(np.logical_and(R[i,:]>= 30, R[i,:]<= 30.3))
But I would like to put the indexes in a matrix.
That is difficult because the number of indexes in each row will be different.
Can anyone help.

Regards,
Swaroop