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Full Discussion: Javascript issue: array.push
Top Forums Programming Javascript issue: array.push Post 302758619 by figaro on Sunday 20th of January 2013 09:21:16 AM
Old 01-20-2013
Code Javascript issue: array.push
I have a code snippet here that is supposed to vary values of certain parameter values:
Code:
<script type="text/javascript">
// dynamic array of which its ultimate size is unknown
// an array of arrays, each consisting of one variation
var variations = []; 

// parameters of how to create a variation
// data structure: initial parameter value, range size, step size
var parameters = [];
parameters[0] = [14, 2, 1];
parameters[1] = [25, 2, 1];
document.write("parameters: " + parameters + "<br>");
for (var j in parameters) document.write("parameters[" + j + "]: " + parameters[j] + "<br>");

// main loop
for (var k in parameters) create_variation(variations, parameters, k);
document.write("variations: " + variations + "<br>");

// create a variation and add it to variations
function create_variation(arr, params, k) {
  var a = [];
  
  // create initial variation
  for (var i = 0; i < params.length; i++) a[i] = params[i][0];
  document.write("initial variation: " + a + "<br>");
  document.write("parameters: " + params[k] + "<br>");

  // create variations
  for (i = params[k][0] - params[k][1]; i < params[k][0] + params[k][1] + 1; i += params[k][2]) { 
    a[k] = i;      // vary parameter value in location k only, leaving the rest intact
    arr.push(a);   // push it onto the variations array
    document.write("k: " + k + "<br>" + "a: " + a + "<br>");
  }
  return arr;
}
</script>

The array parameters is the mapping with which the value is allowed to vary. So in the first case, the value is 14, allowed to vary with value 2 in steps of 1, which by itself would yield: 12, 13, 14, 15, 16.
The variation is with all other values in the parameters array as well. So ultimately there should be an array variations as follows:
Code:
[12,25],[13,25],[14,25],[15,25],[16,25]
[12,23],[13,23],[14,23],[15,23],[16,23]
[12,24],[13,24],[14,24],[15,24],[16,24]
[12,25],[13,25],[14,25],[15,25],[16,25]
[12,26],[13,26],[14,26],[15,26],[16,26]
[12,27],[13,27],[14,27],[15,27],[16,27]

Note that I am not worried about duplicates right now: row 1 and 4 are identical.
I don't understand however why the results returned only yield the following:
Code:
[16,25],[16,25],[16,25],[16,25],[16,25],
[14,27],[14,27],[14,27],[14,27],[14,27]

 

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LEARN ABOUT SUSE

glgetcolortableparameteriv

GLGETCOLORTABLEPARAMETER(3G)											      GLGETCOLORTABLEPARAMETER(3G)

NAME

       glGetColorTableParameterfv, glGetColorTableParameteriv - get color lookup table parameters

C SPECIFICATION

       void glGetColorTableParameterfv( GLenum target,
					GLenum pname,
					GLfloat *params )
       void glGetColorTableParameteriv( GLenum target,
					GLenum pname,
					GLint *params )

PARAMETERS

       target  The   target   color   table.	Must   be   GL_COLOR_TABLE,   GL_POST_CONVOLUTION_COLOR_TABLE,	 GL_POST_COLOR_MATRIX_COLOR_TABLE,
	       GL_PROXY_COLOR_TABLE, GL_PROXY_POST_CONVOLUTION_COLOR_TABLE, GL_PROXY_POST_COLOR_MATRIX_COLOR_TABLE.

       pname   The  symbolic  name  of	a  color  lookup  table  parameter.    Must   be   one	 of   GL_COLOR_TABLE_BIAS,   GL_COLOR_TABLE_SCALE,
	       GL_COLOR_TABLE_FORMAT,	 GL_COLOR_TABLE_WIDTH,	 GL_COLOR_TABLE_RED_SIZE,   GL_COLOR_TABLE_GREEN_SIZE,	 GL_COLOR_TABLE_BLUE_SIZE,
	       GL_COLOR_TABLE_ALPHA_SIZE, GL_COLOR_TABLE_LUMINANCE_SIZE, or GL_COLOR_TABLE_INTENSITY_SIZE.

       params  A pointer to an array where the values of the parameter will be stored.

DESCRIPTION

       Returns parameters specific to color table target.

       When pname is set to GL_COLOR_TABLE_SCALE or GL_COLOR_TABLE_BIAS, glGetColorTableParameter returns the color table scale or bias parameters
       for  the  table	specified  by  target.	 For  these  queries,  target  must  be set to GL_COLOR_TABLE, GL_POST_CONVOLUTION_COLOR_TABLE, or
       GL_POST_COLOR_MATRIX_COLOR_TABLE and params points to an array of four elements, which receive the scale or bias factors  for  red,  green,
       blue, and alpha, in that order.

       glGetColorTableParameter  can  also be used to retrieve the  and size parameters for a color table. For these queries, set target to either
       the color table target or the proxy color table target.	The  and size parameters are set by glColorTable.

       The following table lists the  and size parameters that may be queried.	For each symbolic constant listed below  for  pname,  params  must
       point to an array of the given length, and receive the values indicated.

					   -------------------------------------------------------------------
					   Parameter			   N   Meaning
					   -------------------------------------------------------------------
					   GL_COLOR_TABLE_FORMAT	   1   Internal  (e.g. GL_RGBA)
					   GL_COLOR_TABLE_WIDTH 	   1   Number of elements in table
					   GL_COLOR_TABLE_RED_SIZE	   1   Size of red component, in bits
					   GL_COLOR_TABLE_GREEN_SIZE	   1   Size of green component
					   GL_COLOR_TABLE_BLUE_SIZE	   1   Size of blue component
					   GL_COLOR_TABLE_ALPHA_SIZE	   1   Size of alpha component
					   GL_COLOR_TABLE_LUMINANCE_SIZE   1   Size of luminance component
					   GL_COLOR_TABLE_INTENSITY_SIZE   1   Size of intensity component
					   -------------------------------------------------------------------

NOTES

       glGetColorTableParameter is present only if GL_ARB_imaging is returned when glGetString is called with an argument of GL_EXTENSIONS.

ERRORS

       GL_INVALID_ENUM is generated if target or pname is not an acceptable value.

       GL_INVALID_OPERATION  is generated if glGetColorTableParameter is executed between the execution of glBegin and the corresponding execution
       of glEnd.

SEE ALSO

       glColorTable(3G), glTexParameter(3G), glColorTableParameter(3G)

														      GLGETCOLORTABLEPARAMETER(3G)
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