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Full Discussion: PERL: How do I get both sizes of a matrix?
Top Forums Shell Programming and Scripting PERL: How do I get both sizes of a matrix? Post 302137720 by foo.bar on Wednesday 26th of September 2007 12:49:06 PM
Old 09-26-2007
Bug PERL: How do I get both sizes of a matrix?
Hi everybody,

I have a matrix called @matrix dinamically built in PERL, so I don't know its exact sizes. It is a 2-dimensional matrix, so its elements are for example:

$matrix[0][0]
$matrix[0][1]
$matrix[1][0]
$matrix[1][1]
$matrix[2][0]
etc...

I know i can get the number of the rows of the matrix with the commands:

$#matrix
scalar @matrix
$n_rows = @matrix

but I don't know how to get the number of the colums of the matrix!
I tried several ways like:

$#matrix[0]
scalar @matrix[0]
$n_cols = @matrix[0]

but they haven't worked.

Can someone help me please? Thank you in advance,

Sergio.
 

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LEARN ABOUT REDHAT

glpopmatrix

GLPUSHMATRIX(3G)														  GLPUSHMATRIX(3G)

NAME

       glPushMatrix, glPopMatrix - push and pop the current matrix stack

C SPECIFICATION

       void glPushMatrix( void )

C SPECIFICATION

       void glPopMatrix( void )

DESCRIPTION

       There  is  a  stack  of	matrices for each of the matrix modes.	In GL_MODELVIEW mode, the stack depth is at least 32.  In the other modes,
       GL_COLOR, const(PROJECTION), and GL_TEXTURE, the depth is at least 2.  The current matrix in any mode is the matrix on the top of the stack
       for that mode.

       glPushMatrix  pushes  the current matrix stack down by one, duplicating the current matrix.  That is, after a glPushMatrix call, the matrix
       on top of the stack is identical to the one below it.

       glPopMatrix pops the current matrix stack, replacing the current matrix with the one below it on the stack.

       Initially, each of the stacks contains one matrix, an identity matrix.

       It is an error to push a full matrix stack, or to pop a matrix stack that contains only a single matrix.  In either case, the error flag is
       set and no other change is made to GL state.

ERRORS

       GL_STACK_OVERFLOW is generated if glPushMatrix is called while the current matrix stack is full.

       GL_STACK_UNDERFLOW is generated if glPopMatrix is called while the current matrix stack contains only a single matrix.

       GL_INVALID_OPERATION  is generated if glPushMatrix or glPopMatrix is executed between the execution of glBegin and the corresponding execu-
       tion of glEnd.

ASSOCIATED GETS

       glGet with argument GL_MATRIX_MODE
       glGet with argument GL_COLOR_MATRIX
       glGet with argument GL_MODELVIEW_MATRIX
       glGet with argument GL_PROJECTION_MATRIX
       glGet with argument GL_TEXTURE_MATRIX
       glGet with argument GL_COLOR_STACK_DEPTH
       glGet with argument GL_MODELVIEW_STACK_DEPTH
       glGet with argument GL_PROJECTION_STACK_DEPTH
       glGet with argument GL_TEXTURE_STACK_DEPTH
       glGet with argument GL_MAX_MODELVIEW_STACK_DEPTH
       glGet with argument GL_MAX_PROJECTION_STACK_DEPTH
       glGet with argument GL_MAX_TEXTURE_STACK_DEPTH

SEE ALSO

       glFrustum(3G),  glLoadIdentity(3G),  glLoadMatrix(3G),  glMatrixMode(3G),   glMultMatrix(3G),   glOrtho(3G),   glRotate(3G),   glScale(3G),
       glTranslate(3G), glViewport(3G)

																  GLPUSHMATRIX(3G)
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