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mfind()
Description:
Search for positions of non-zero members in a vector or matrix.
Syntax:
mfind(A, n)
Note:
The external library function (See External Library Guide) searches for positions of the first n non-zero members in vector or matrix A.
It gets the position of the first non-zero member when parameter n is absent. If the total number of non-zero members is fewer than n, it returns positions of all non-zero, non-null members.
Search column by column when A is a matrix and return sequence numbers of positions of non-zero members in the matrix.
Parameter:
|
A |
A vector or a matrix. |
|
n |
A positive integer. |
Return value:
Sequence
Example:
|
|
A |
|
|
1 |
[0,,5,2,0,2,1,0] |
|
|
2 |
=mfind(A1) |
Return position of the first non-zero member as parameter n is absent. |
|
3 |
=mfind(A1,3) |
Return positions of the first non-zero members. |
|
4 |
=mfind(A1,10) |
Return positions of all non-zero members since the number of them in matrix A1 is fewer than n (here is 10). |
|
5 |
[[1,0,2],[0,0,2],[0,4,7]] |
|
|
6 |
=mfind(A5,3) |
As parameter A is a matrix, search for the first three non-zero members by column and the result are “1”,“4”,”2”, whose sequence numbers of positions are 1,6,7. |
