HP Prime SIZE and OBJ-> with matrices/vectors/lists

[Helge Gabert]

Two questions:

1) I'm writing a program for the HP Prime where I would like to get the dimensions for an nxm matrix (user inputs the matrix).

On the 50g, I can use SIZE and I'll get the dimensions as a list {n m}. On the Prime, I only get the row dimensions n.

Any idea on how to get the column dimensions as well? Thanks.

2) Also, the 50G has the command OBJ->, spitting out all the elements (plus the dimensions) of matrices, vectors, or lists onto the stack. On the Prime, do I need to write a program to achieve this (basically, calling each element in a loop)? That's what I need SIZE for - - see above. Thanks again!

[iconmaster]

1) Try rowDim and colDim.

2) The programming language does not work on a stack, so an OBJ-> equivalent would be almost useless. Simply call each element in sequence.

[Tim Wessman]

1) SIZE on a matrix here seems to return { r, c } ???

2) m1(r,c) for direct access/storage.

TW

[Helge Gabert]

Yes, in home view you get {n m}, but not in CAS view (only n).

This brings up an interesting question - - if the user runs the program in home view vs. CAS view, are there possible inconsistencies to contend with?

[Han]

Quote:

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Yes, in home view you get {n m}, but not in CAS view (only n).

This brings up an interesting question - - if the user runs the program in home view vs. CAS view, are there possible inconsistencies to contend with?

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Probably because in CAS it's treated as a "vector of vectors" (with which I disagree).

[Helge Gabert]

Thanks for the insight . . . that would explain it . . . but then you HAVE to be in home view for things to work properly, or not?

[Tim Wessman]

No, the programs created normally in the program catalog are numerical in nature. Thus any call to "size" will be the correct one - whether called from the CAS or anywhere else.

CAS functions can be created, but currently only by manually creating them in the CAS environment. eg: myfunc(a,b,c):=begin a+b+c; end; [ENTER]

TW

[Helge Gabert]

OK Thanks!

[Helge Gabert]

Yes that works. Thanks for rowDim and colDim!