Re: [Bug-apl] inner product behaviour?

[Juergen Sauermann]

Hi, the standard says: If the last-item in the shape-list of A1 is not the same as the first-item in the shape-list of B1, signal length-error. Scalar A or B are turned into vectors, but vectors are not turned into matrices. In your example the last dimension of A was 2 and the first dimension of B was 3. /// Jürgen On 08/15/2015 08:22 PM, alexwei...@alexweiner.com wrote: Hi Bug APL, Does the inner product coerce a vector to a matrix only when (⍴right arg vector)≤ left arg number of columns (when it is a matrix)?       rotatemat←{2 2 ⍴ (2○⍵)(-1○⍵)(1○⍵)(2○⍵)}       rm←rotatmat 3 VALUE ERROR       rm←rotatmat 3          ^       rm←rotatemat 3       rm ¯0.9899924966 ¯0.1411200081  0.1411200081 ¯0.9899924966       rm+.×(1 1)  ¯1.131112505 ¯0.8488724885       rm+.×(1 1)(2 2)  ¯1.272232513 ¯1.272232513  ¯1.838864985 ¯1.838864985        rm+.×(1 1)(2 2)(3 3) LENGTH ERROR       rm+.×(1 1) (2 2) (3 3)       ^   ^       rm+.×1 3⍴(1 1)(2 2)(3 3)  ¯1.131112505 ¯1.131112505    ¯2.262225009 ¯2.262225009  ¯3.393337514        ¯3.393337514   ¯0.8488724885 ¯0.8488724885  ¯1.697744977 ¯1.697744977  ¯2.546617466        ¯2.546617466