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Radu Mihail


Last seen: 3 months ago Active since 2016

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Find back lost values from an original matrix of derived incomplete column vectors
I have a matrix M and I am extracting a submatrix A of selected column vectors from M , without keeping the values of the third...

3 months ago | 1 answer | 0

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answer

Question


Sort column vectors of a matrix and extract a new vector from a maximal criterion
I do have a huge nx4 matrix M in which its column vectors are listed according to given categories. All column vectors from the ...

3 months ago | 1 answer | 0

1

answer

Question


How to count the frequency of each type of column vector present in a matrix
I have a matrix R(21,3) R=[1,1,1,2,2,2,1,2,2,1,4,2,2,2,2,1,2,1,3,1,1;1,1,2,2,2,1,2,2,1,4,2,2,2,2,1,2,1,3,1,1,1;1,2,2,2,1,2,2,...

8 months ago | 1 answer | 0

1

answer

Question


Loop does not save intermediary steps
I have a huge matrix A(1540,1540) I am trying to get all its diagonals under the main one at 3n+1 steps in separate vectors x ...

11 months ago | 1 answer | 0

1

answer

Question


Define new operations for a matrix
I have 2 vectors x=[0 1 2 0 1 0 3 1 0] and its transposed column vector y=x' I need to define a new operation , let's say * fo...

11 months ago | 2 answers | 0

2

answers

Question


How to calculate the total number of incidences of a kj part in all compositions of a natural number N
A composition of natural number N is a partition in ki summands(parts) of N=k1+k2+k3+k4...+ki , with ki >or =1 and ki<N, where t...

3 years ago | 1 answer | 0

1

answer

Question


I need to partition an input vector v into smaller series of subvectors each containing the whole array of a periodic pattern given by a local sum of successive elements in the array.
I need to partition an input vector v into smaller series of subvectors each containing the whole array of a periodic pattern g...

5 years ago | 1 answer | 0

1

answer