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Top Forums Shell Programming and Scripting Hi ! whether it is possible to do interpolation in scripting... Post 302739923 by RudiC on Wednesday 5th of December 2012 06:59:55 AM
Old 12-05-2012
I'm not sure I understand either. You want to generate data points every 0.5 m. Depth ranging from 0.789 to 8.305 you will get sth. like 16 data points, say 1, 1.5, ..., 8.5. So why don't you collect the temperatue and salinity into avarages around those abcissa values?
Why do you crack a nut with a sledge hammer, averaging 23 values for 0.789m, when everything will disappear in a large lump sum at 1.0m?
BTW, nit-picking, you can have difference quotients on those columns but no derivatives. And, I think it would be helpful to use one single sample file to discuss and attach, so col 1 would be col 1 everywhre.

And, finally answering your introductory question, yes, I'm pretty sure you can do (some degree of) interpolation in scripts.
 

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IMAGESETINTERPOLATION(3)						 1						  IMAGESETINTERPOLATION(3)

imagesetinterpolation - Set the interpolation method

SYNOPSIS
bool imagesetinterpolation (resource $image, [int $method = IMG_BILINEAR_FIXED]) DESCRIPTION
Sets the interpolation method, setting an interpolation method affects the rendering of various functions in GD, such as the imagero- tate(3) function. PARAMETERS
o $ image -An image resource, returned by one of the image creation functions, such as imagecreatetruecolor(3). o $method - The interpolation method, which can be one of the following: o IMG_BELL: Bell filter. o IMG_BESSEL: Bessel filter. o IMG_BICUBIC: Bicubic interpolation. o IMG_BICUBIC_FIXED: Fixed point implementation of the bicubic interpolation. o IMG_BILINEAR_FIXED: Fixed point implementation of the bilinear interpolation ( default (also on image creation)). o IMG_BLACKMAN: Blackman window function. o IMG_BOX: Box blur filter. o IMG_BSPLINE: Spline interpolation. o IMG_CATMULLROM: Cubic Hermite spline interpolation. o IMG_GAUSSIAN: Gaussian function. o IMG_GENERALIZED_CUBIC: Generalized cubic spline fractal interpolation. o IMG_HERMITE: Hermite interpolation. o IMG_HAMMING: Hamming filter. o IMG_HANNING: Hanning filter. o IMG_MITCHELL: Mitchell filter. o IMG_POWER: Power interpolation. o IMG_QUADRATIC: Inverse quadratic interpolation. o IMG_SINC: Sinc function. o IMG_NEAREST_NEIGHBOUR: Nearest neighbour interpolation. o IMG_WEIGHTED4: Weighting filter. o IMG_TRIANGLE: Triangle interpolation. RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 imagesetinterpolation(3) example <?php // Load an image $im = imagecreate(500, 500); // By default interpolation is IMG_BILINEAR_FIXED, switch // to use the 'Mitchell' filter: imagesetinterpolation($im, IMG_MITCHELL); // Continue to work with $im ... ?> NOTES
Changing the interpolation method affects the following functions when rendering: oimageaffine(3) oimagerotate(3) oimagescale(3) PHP Documentation Group IMAGESETINTERPOLATION(3)
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