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Top Forums Shell Programming and Scripting how can i find sqrt of a any number without using expr Post 302307336 by otheus on Wednesday 15th of April 2009 06:15:26 AM
Old 04-15-2009
Heh, That expression is very problematic. Here's one that works. The first argument is a number, which becomes 0 if it's not provided or if it is less than 0. The second argument is the number of decimal places to output -- or 4 if not provided.
Code:
y=$1
scale=4
# Make sure input is a valid number.
test -n "$y" || y=0; test "$y" -ge 0 || y=0
# Make sure scale is some number
test -z "$2" || scale=$2
# calc square root via bc
{ echo "scale=$scale"; echo "sqrt($y)" ; } | bc

 

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ttk::scale(n)							 Tk Themed Widget						     ttk::scale(n)

__________________________________________________________________________________________________________________________________________________

NAME
ttk::scale - Create and manipulate a scale widget SYNOPSIS
ttk::scale pathName ?options...? _________________________________________________________________ DESCRIPTION
A ttk::scale widget is typically used to control the numeric value of a linked variable that varies uniformly over some range. A scale dis- plays a slider that can be moved along over a trough, with the relative position of the slider over the trough indicating the value of the variable. STANDARD OPTIONS
-class -cursor -style -takefocus See the ttk_widget manual entry for details on the standard options. WIDGET-SPECIFIC OPTIONS [-command command] Specifies the prefix of a Tcl command to invoke whenever the scale's value is changed via a widget command. The actual command consists of this option followed by a space and a real number indicating the new value of the scale. [-from from] A real value corresponding to the left or top end of the scale. [-length length] Specifies the desired long dimension of the scale in screen units (i.e. any of the forms acceptable to Tk_GetPixels). For vertical scales this is the scale's height; for horizontal scales it is the scale's width. [-orient orient] Specifies which orientation whether the widget should be laid out horizontally or vertically. Must be either hori- zontal or vertical or an abbreviation of one of these. [-to to] Specifies a real value corresponding to the right or bottom end of the scale. This value may be either less than or greater than the from option. [-value value] Specifies the current floating-point value of the variable. [-variable variable] Specifies the name of a global variable to link to the scale. Whenever the value of the variable changes, the scale will update to reflect this value. Whenever the scale is manipulated interactively, the variable will be modified to reflect the scale's new value. WIDGET COMMAND
pathName cget option Returns the current value of the specified option; see ttk::widget(n). pathName configure ?option? ?value option value ...? Modify or query widget options; see ttk::widget(n). pathName get ?x y? Get the current value of the -value option, or the value corresponding to the coordinates x,y if they are specified. X and y are pixel coordinates relative to the scale widget origin. pathName identify x y Returns the name of the element at position x, y. See ttk::widget(n). pathName instate statespec ?script? Test the widget state; see ttk::widget(n). pathName set value Set the value of the widget (i.e. the -value option) to value. The value will be clipped to the range given by the -from and -to options. Note that setting the linked variable (i.e. the variable named in the -variable option) does not cause such clipping. pathName state ?stateSpec? Modify or query the widget state; see ttk::widget(n). INTERNAL COMMANDS
pathName coords ?value? Get the coordinates corresponding to value, or the coordinates corresponding to the current value of the -value option if value is omitted. SEE ALSO
ttk::widget(n), scale(n) KEYWORDS
scale, slider, trough, widget Tk 8.5 ttk::scale(n)
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