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Shell Programming and Scripting
awk - continue when encountered division error
Post 302870765 by vgersh99 on Monday 4th of November 2013 04:37:37 PM
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How can I modify my awk code to get rid of the divion by zero error message? If I run the script without an input file, it should return error message "Input file missing" but not divison by zero.
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input
0 0 9820373 2069 0 0 11485482
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LEARN ABOUT DEBIAN
glblendequation
GLBLENDEQUATION(3G) [FIXME: manual] GLBLENDEQUATION(3G) NAME
glBlendEquation - specify the equation used for both the RGB blend equation and the Alpha blend equation C SPECIFICATION
void glBlendEquation(GLenum mode); void glBlendEquationi(GLuint buf, GLenum mode); PARAMETERS
buf for glBlendEquationi, specifies the index of the draw buffer for which to set the blend equation. mode specifies how source and destination colors are combined. It must be GL_FUNC_ADD, GL_FUNC_SUBTRACT, GL_FUNC_REVERSE_SUBTRACT, GL_MIN, GL_MAX. DESCRIPTION
The blend equations determine how a new pixel (the ''source'' color) is combined with a pixel already in the framebuffer (the ''destination'' color). This function sets both the RGB blend equation and the alpha blend equation to a single equation. glBlendEquationi specifies the blend equation for a single draw buffer whereas glBlendEquation sets the blend equation for all draw buffers. These equations use the source and destination blend factors specified by either glBlendFunc() or glBlendFuncSeparate(). See glBlendFunc() or glBlendFuncSeparate() for a description of the various blend factors. In the equations that follow, source and destination color components are referred to as R s G s B s A s and R d G d B d A d, respectively. The result color is referred to as R r G r B r A r. The source and destination blend factors are denoted s R s G s B s A and d R d G d B d A, respectively. For these equations all color components are understood to have values in the range 0 1. +-----------------------------+---------------------------------------------------+---------------------------------------------------+ | | | | | Mode | RGB | Alpha | | | Components | Component | | | | | +-----------------------------+---------------------------------------------------+---------------------------------------------------+ |GL_FUNC_ADD | <div> | <div> | | | | | | | | | | | Rr | Ar | | | = | = | | | | | | | R | A | | | s | s | | | | | | | | | | | s | s | | | R | A | | | | | | | + | + | | | R | A | | | d | d | | | | | | | | | | | d | d | | | R | A | | | | | | | | | | | | | | | </div> | </div> | | | <div> | | | | | | | | | | | | Gr | | | | = | | | | | | | | G | | | | s | | | | | | | | | | | | s | | | | G | | | | | | | | + | | | | G | | | | d | | | | | | | | | | | | d | | | | G | | | | | | | | | | | | | | | | </div> | | | | <div> | | | | | | | | | | | | Br | | | | = | | | | | | | | B | | | | s | | | | | | | | | | | | s | | | | B | | | | | | | | + | | | | B | | | | d | | | | | | | | | | | | d | | | | B | | | | | | | | | | | | | | | | </div> | | +-----------------------------+---------------------------------------------------+---------------------------------------------------+ |GL_FUNC_SUBTRACT | <div> | <div> | | | | | | | | | | | Rr | Ar | | | = | = | | | | | | | R | A | | | s | s | | | | | | | | | | | s | s | | | R | A | | | | | | | - | - | | | R | A | | | d | d | | | | | | | | | | | d | d | | | R | A | | | | | | | | | | | | | | | </div> | </div> | | | <div> | | | | | | | | | | | | Gr | | | | = | | | | | | | | G | | | | s | | | | | | | | | | | | s | | | | G | | | | | | | | - | | | | G | | | | d | | | | | | | | | | | | d | | | | G | | | | | | | | | | | | | | | | </div> | | | | <div> | | | | | | | | | | | | Br | | | | = | | | | | | | | B | | | | s | | | | | | | | | | | | s | | | | B | | | | | | | | - | | | | B | | | | d | | | | | | | | | | | | d | | | | B | | | | | | | | | | | | | | | | </div> | | +-----------------------------+---------------------------------------------------+---------------------------------------------------+ |GL_FUNC_REVERSE_SUBTRACT | <div> | <div> | | | | | | | | | | | Rr | Ar | | | = | = | | | | | | | R | A | | | d | d | | | | | | | | | | | d | d | | | R | A | | | | | | | - | - | | | R | A | | | s | s | | | | | | | | | | | s | s | | | R | A | | | | | | | | | | | | | | | </div> | </div> | | | <div> | | | | | | | | | | | | Gr | | | | = | | | | | | | | G | | | | d | | | | | | | | | | | | d | | | | G | | | | | | | | - | | | | G | | | | s | | | | | | | | | | | | s | | | | G | | | | | | | | | | | | | | | | </div> | | | | <div> | | | | | | | | | | | | Br | | | | = | | | | | | | | B | | | | d | | | | | | | | | | | | d | | | | B | | | | | | | | - | | | | B | | | | s | | | | | | | | | | | | s | | | | B | | | | | | | | | | | | | | | | </div> | | +-----------------------------+---------------------------------------------------+---------------------------------------------------+ |GL_MIN | <div> | <div> | | | | | | | | | | | Rr | Ar | | | = | = | | | | | | | min | min | | | | | | | | | | | | | | | R | A | | | s | s | | | | | | | | | | | | | | | R | A | | | d | d | | | | | | | | | | | | | | | | | | | | | | | </div> | </div> | | | <div> | | | | | | | | | | | | Gr | | | | = | | | | | | | | min | | | | | | | | | | | | | | | | G | | | | s | | | | | | | | | | | | | | | | G | | | | d | | | | | | | | | | | | | | | | | | | | | | | | </div> | | | | <div> | | | | | | | | | | | | Br | | | | = | | | | | | | | min | | | | | | | | | | | | | | | | B | | | | s | | | | | | | | | | | | | | | | B | | | | d | | | | | | | | | | | | | | | | | | | | | | | | </div> | | +-----------------------------+---------------------------------------------------+---------------------------------------------------+ |GL_MAX | <div> | <div> | | | | | | | | | | | Rr | Ar | | | = | = | | | | | | | max | max | | | | | | | | | | | | | | | R | A | | | s | s | | | | | | | | | | | | | | | R | A | | | d | d | | | | | | | | | | | | | | | | | | | | | | | </div> | </div> | | | <div> | | | | | | | | | | | | Gr | | | | = | | | | | | | | max | | | | | | | | | | | | | | | | G | | | | s | | | | | | | | | | | | | | | | G | | | | d | | | | | | | | | | | | | | | | | | | | | | | | </div> | | | | <div> | | | | | | | | | | | | Br | | | | = | | | | | | | | max | | | | | | | | | | | | | | | | B | | | | s | | | | | | | | | | | | | | | | B | | | | d | | | | | | | | | | | | | | | | | | | | | | | | </div> | | +-----------------------------+---------------------------------------------------+---------------------------------------------------+ The results of these equations are clamped to the range 0 1. The GL_MIN and GL_MAX equations are useful for applications that analyze image data (image thresholding against a constant color, for example). The GL_FUNC_ADD equation is useful for antialiasing and transparency, among other things. Initially, both the RGB blend equation and the alpha blend equation are set to GL_FUNC_ADD. NOTES
The GL_MIN, and GL_MAX equations do not use the source or destination factors, only the source and destination colors. ERRORS
GL_INVALID_ENUM is generated if mode is not one of GL_FUNC_ADD, GL_FUNC_SUBTRACT, GL_FUNC_REVERSE_SUBTRACT, GL_MAX, or GL_MIN. GL_INVALID_VALUE is generated by glBlendEquationi if buf is greater than or equal to the value of GL_MAX_DRAW_BUFFERS. ASSOCIATED GETS
glGet() with an argument of GL_BLEND_EQUATION_RGB glGet() with an argument of GL_BLEND_EQUATION_ALPHA SEE ALSO
glBlendColor(), glBlendFunc() glBlendFuncSeparate() COPYRIGHT
Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/. [FIXME: source] 05/30/2012 GLBLENDEQUATION(3G)