Added matrix operations - #12
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DurieuxPol
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Feb 17, 2026
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| PMMatrix >> columnAverage [ | ||
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| ^ (1 to: self numberOfColumns) collect: [ :colIndex | | ||
| (self columnAt: colIndex) average ] | ||
| ] |
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I added this method to have the average of each column of the matrix.
DurieuxPol
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Feb 17, 2026
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| PMMatrix >> rowWiseSubstractionWith: aRow [ | ||
| "Assume a collection is a matrix of one row" | ||
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| | result | | ||
| result := self class rows: self numberOfRows columns: self numberOfColumns. | ||
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| 1 to: self numberOfColumns do: [ :col | | ||
| | me | | ||
| me := self atColumn: col. | ||
| result atColumn: col put: me - (aRow at: col) ]. | ||
| ^ result | ||
| ] |
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I also added this method to subtract a vector to each row of a matrix.
For example:
matrix := PMMatrix rows: #( #( 1 2 ) #( 3 4 ) ).
vector := #( 1 2 ) asPMVector.
matrix -= vector.This gives:
PMMatrix rows: #( #( 0 0 ) #( 2 2) )It is similar to the -= method from AIContiguousMatrix.
And I added a -= method also to PMMatrix that calls this method, for convenience.
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Added methods to have the average of each column, and to subtract a vector to each row.