Feature #10069: [PATCH] Implement monadic operator for Matrix

• Status: Closed
• Assignee: marcandre (Marc-Andre Lafortune)
• Target version: 2.2.0

[gogotanaka (Kazuki Tanaka)]

Before

m = Matrix[[1,2,3], [4,5,6]]
 
+ m
NoMethodError: undefined method `+@' for Matrix[[1, 2, 3], [4, 5, 6]]:Matrix

- m
NoMethodError: undefined method `-@' for Matrix[[1, 2, 3], [4, 5, 6]]:Matrix

After

m = Matrix[[1,2,3], [4,5,6]]

+ m
=> Matrix[[1, 2, 3], [4, 5, 6]]

- m
=> Matrix[[-1, -2, -3], [-4, -5, -6]]

I think monadic operator for Matrix is important, when I use operator as block. like that

matrix_ary.inject(:+)

[matz (Yukihiro Matsumoto)]

• Related to Feature #10068: [PATCH] Implement monadic operator for Vector added

[matz (Yukihiro Matsumoto)]

As #10068, I like the idea, but unary operator has nothing related to inject though.

Matz.

[gogotanaka (Kazuki Tanaka)]

Yukihiro Matsumoto wrote:

unary operator has nothing related to inject though.

It's kind of my mistake, sorry to confuse you.

I think it not seldom happens that we want do this(term monadic). And this is based on custom in math.

Compared with some other numerical analysis software(MATLAB, mathematica, GNU Octave, R, NumPy),

They have term monadic for matrix, vector. (But you can say "this is ruby issue! this is no business of how other softwares are" )

thank you.

gogo.

[hsbt (Hiroshi SHIBATA)]

• Assignee set to marcandre (Marc-Andre Lafortune)
• Category set to lib
• Status changed from Open to Assigned
• Target version set to 2.2.0

[marcandre (Marc-Andre Lafortune)]

• Status changed from Assigned to Closed

Done.

Thanks for catching this omission, and for the patch.