Re: [Gnuplot-info] Help, my gnuplot script is too slow

[<she...@be...>]

OK so the use of "index" is not like the use of fseek in C. So how can I
advance to a particular data set in a file of multiple data sets without
having to parse the entire file each time? That is, how can I do something
like a fseek?


> Hi Gnuploteers
>
> I have written a gnuplot script that is behaving sluggishly at times. The
> script appears below. The script reads and plots image data from an ascii
> file. The file contains multiple 2D images and the sluggishness appears
> to scale with the number of 2D images contained within the file. The
> script advances through the 2D images depending upon whether an up or
> down arrow key is pressed. The sluggishness occurs after this key press.
> With 10 2D images in the data file the time between arrow press and the
> display of the next 2D image is acceptable. When 400 2D images are present
> in the data file then the time between arrow press and the display of the
> next 2D image is not acceptable (8 seconds).
>
> Does anybody know how I might remove this sluggishness? What is causing
> this sluggishness?
>
> Thanks again for the great software and advice!
>
>
> reset
> unset key
> unset colorbox
> unset border
> unset xtics
> unset ytics
> unset ztics
> set palette gray
>
> set multiplot
> i = 0
> set size .25,1
> set origin 0,0
> set xrange [0:5]
> set yrange [0:25]
> plot 't_space.dat' index i using 1:2:3 with labels left
> set autoscale
> set size square 1
> set origin .10, 0
> plot 't_space.dat' index i+1 matrix with image
> unset multiplot
>
>
> # Advance or decrement the slice depending upon key press.
>
> bind "Up" "i=i+2;              \
>            reset;              \
>            unset key;          \
>            unset colorbox;     \
>            unset border;       \
>            unset xtics;        \
>            unset ytics;        \
>            unset ztics;        \
>            set palette gray;   \
>            set multiplot;      \
>            set size .25,1;     \
>            set origin 0,0;     \
>            set xrange [0:5];   \
>            set yrange [0:25];  \
>            plot 't_space.dat' index i using 1:2:3 with labels left; \
>            set autoscale;      \
>            set size square 1;  \
>            set origin .10, 0;  \
>            plot 't_space.dat' index i+1 matrix with image; \
>            unset multiplot;"
>
>
> bind "Down" "i=i-2; \
>              reset; \
>              unset key; \
>              unset colorbox; \
>              unset border; \
>              unset xtics; \
>              unset ytics; \
>              unset ztics; \
>              set palette gray; \
>              set multiplot; \
>              set size .25,1; \
>              set origin 0,0; \
>              set xrange [0:5]; \
>              set yrange [0:25]; \
>              plot 't_space.dat' index i using 1:2:3 with labels left; \
>              set autoscale; \
>              set size square 1; \
>              set origin .10, 0; \
>              plot 't_space.dat' index i+1 matrix with image; \
>              unset multiplot;"
>
>
>
>
>
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> GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the
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