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Full Discussion: Generate list of letters
Top Forums Shell Programming and Scripting Generate list of letters Post 302924083 by sea on Thursday 6th of November 2014 06:58:20 AM
Old 11-06-2014
I guess it would be easier to make a simple hardcoded letter-list?

EDIT:
Thank you RudiC

---------- Post updated at 12:58 ---------- Previous update was at 12:05 ----------

So, having now a function to 'transform' a number into a letter.
Any performance suggestions?

Code:
	list=( $(echo {a..z} ))

	num2char() { # NUM
	# Returns a letter string: a-z
	# Or: aa-az ba-bz, etc
		num=$1
		out=""
		if [[ $num -lt ${#list[@]} ]]
		then	out="${list[$num]}"
		else	high=$[ $num / ${#list[@]} ]
			out="${list[$high-1]}${list[$num - ($high * ${#list[@]})]}"
		fi
		echo "$out"
	}

Code:
time ./tui-list -a {a..z} \
	{a..z} {a..z} {a..z} \
	{a..z} {a..z} {a..z} \
	{a..z} {a..z} {a..z} \
	{a..z} {a..z} {a..z} \
	{a..z} {a..z} {a..z}
..
...
# | ox) x                                                                                                          | #
# | oy) y                                                                                                          | #
# | oz) z                                                                                                          | #
DEBUG 416 lines shown

real	0m2.671s
user	0m0.788s
sys	0m0.609s

Have a good day

EDIT:
Ouch, without tui-echo, but just echo, its like more than 2 secs faster..
Guess it's all fine then Smilie
Code:
...
oz) z
DEBUG 416 lines shown

real	0m0.218s
user	0m0.030s
sys	0m0.041s

Guess its the interface causing the slowness.
Last edited by sea; 11-06-2014 at 07:30 AM..
 

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LEARN ABOUT REDHAT

glpassthrough

GLPASSTHROUGH(3G)														 GLPASSTHROUGH(3G)

NAME

       glPassThrough - place a marker in the feedback buffer

C SPECIFICATION

       void glPassThrough( GLfloat token )

PARAMETERS

       token  Specifies a marker value to be placed in the feedback buffer following a GL_PASS_THROUGH_TOKEN.

DESCRIPTION

       Feedback  is  a GL render mode.	The mode is selected by calling glRenderMode with GL_FEEDBACK.	When the GL is in feedback mode, no pixels
       are produced by rasterization.  Instead, information about primitives that would have been rasterized is fed back to the application  using
       the GL.	See the glFeedbackBuffer reference page for a description of the feedback buffer and the values in it.

       glPassThrough inserts a user-defined marker in the feedback buffer when it is executed in feedback mode.  token is returned as if it were a
       primitive; it is indicated with its own unique identifying value: GL_PASS_THROUGH_TOKEN.  The order of glPassThrough commands with  respect
       to the specification of graphics primitives is maintained.

NOTES

       glPassThrough is ignored if the GL is not in feedback mode.

ERRORS

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

ASSOCIATED GETS

       glGet with argument GL_RENDER_MODE

SEE ALSO

       glFeedbackBuffer(3G), glRenderMode(3G)

																 GLPASSTHROUGH(3G)
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