question about Inner

Question

question1:

(code 1 something wrong, Why? and how to overcome this to achieve the next code's effect)

Inner[RotationTransform,{Pi/4,Pi/4,Pi/4},{{0,0,1},{1,0,0},{0,0,1}},Composition]

(code2 it's ok, but seems type too much characters)

Inner[RotationTransform,{Pi/4,Pi/4,Pi/4},{xx,yy,zz},Composition]/.
                                           Thread[Rule[{xx,yy,zz},{{0,0,1},{1,0,0},{0,0,1}}]]

Any other codes or tips are welcome.

Use Composition @@ MapThread[RotationTransform, {{Pi/4, Pi/4, Pi/4}, {{0, 0, 1}, {1, 0, 0}, {0, 0, 1}}}] instead. — J. M.'s missing motivation, May 04 '13 at 01:53
@J. M. ok, I found this is more simpler in my original code'style.
Inner[RotationTransform,{Pi/4,Pi/4,Pi/4},Hold/@{{0,0,1},{1,0,0},{0,0,1}},Composition]//Release — HyperGroups, May 04 '13 at 02:04

score 8 · Accepted Answer · answered May 04 '13 at 04:20

8

you can just add Unevaluated to prevent Inner from seeing inside:

Inner[RotationTransform, {Pi/4, Pi/4, Pi/4}, 
 Unevaluated /@ {{0, 0, 1}, {1, 0, 0}, {0, 0, 1}}, Composition]

answered May 04 '13 at 04:20

kptnw

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question about Inner

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