gnuplot-info

[Gnuplot-info] how to plot series divided by element of series

[michael <mic...@ma...>]

Afternoon fellow GNUs!

Maybe I've missed something, being a new convert to gnuplot, but I  
wish to read in some data (NumOfCores,Seconds) and plot 2 graphs. The  
first graph is Seconds (y-axis) against NumOfCores and I've managed.  
However, the second graph is to plot the speed-up, defined on p cores  
as t(1)/t(p) where t(p) is the time taken on p cores. I can't find the  
correct syntax, eg I failed with
   plot 'timings' using 1:($2[1]/$2) with linespoints

Could somebody explain what I should be doing?

Many thanks,
Michael
www.rcs.manchester.ac.uk
www.twitter.com/mkbane_mcr

[Gnuplot-info] how to plot series divided by element of series

[michael b. <mic...@ma...>]

Afternoon fellow GNUs!

Maybe I've missed something, being a new convert to gnuplot, but I  
wish to read in some data (NumOfCores,Seconds) and plot 2 graphs. The  
first graph is Seconds (y-axis) against NumOfCores and I've managed.  
However, the second graph is to plot the speed-up, defined on p cores  
as t(1)/t(p) where t(p) is the time taken on p cores. I can't find the  
correct syntax, eg I failed with
   plot 'timings' using 1:($2[1]/$2) with linespoints

Could somebody explain what I should be doing?

Many thanks,
Michael
www.rcs.manchester.ac.uk
www.twitter.com/mkbane_mcr

Re: [Gnuplot-info] how to plot series divided by element of series

[Thomas S. <t.s...@fz...>]

you need to store the t(1) value in a variable:

plot 'timings' using 1:($0==0?v=$2:0 , v/$2) with linespoints


michael bane wrote:
> 
> Afternoon fellow GNUs!
> 
> Maybe I've missed something, being a new convert to gnuplot, but I  
> wish to read in some data (NumOfCores,Seconds) and plot 2 graphs. The  
> first graph is Seconds (y-axis) against NumOfCores and I've managed.  
> However, the second graph is to plot the speed-up, defined on p cores  
> as t(1)/t(p) where t(p) is the time taken on p cores. I can't find the  
> correct syntax, eg I failed with
>    plot 'timings' using 1:($2[1]/$2) with linespoints
> 
> Could somebody explain what I should be doing?
> 
> Many thanks,
> Michael
> www.rcs.manchester.ac.uk
> www.twitter.com/mkbane_mcr
> 
> 
> 
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