Mathc initiation/Fichiers h : c49bb

En pratique

Vous pouvez tester ces exemples en les copiant directement dans gnuplot. Il suffit ensuite de taper return pour effectuer les commandes.

Pngcairo test

test

Cet exemple donne les informations de base.

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test
reset
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Le passage à la ligne

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#  \n ->   \
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plot cos(x),\
     sin(x),\
         .4,\
        -.4
reset
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Chaine de caractères

linetype | lt <0..15>

Chaque nombre correspond à une couleur différente. (voir test)

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#  linetype  | lt <0..15> 
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plot cos(x) lt 1,\
     sin(x) lt 2,\
        .4  lt 3,\
       -.4  lt 3
reset
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linewidth | lw <1.. 6>

Chaque nombre correspond à une épaisseur différente.

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#  #  linewidth | lw <1.. 6>
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plot cos(x) lt 1 lw 1,\
     sin(x) lt 2 lw 3,\
        .4  lt 3 lw 4,\
       -.4  lt 3 lw 6
reset
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Liste de points

plot "data"

Dessiner une liste de points.

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plot "data" 
reset
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Créer un fichier "data" avec ces données :

pointtype | pt <0..15>

Chaque nombre correspond à un dessin différent de points. (voir test)

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#  pointtype | pt <0..15>
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plot "data" pt 10
reset
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pointsize | ps <1.. >

Chaque nombre correspond à une taille de points différents. (voir test)

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#  pointsize | ps <1..  >
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plot "data" pt 10  ps 3
reset
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with linesp

Les points sont réliés par des segments.

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#  linetype  | lt <0..15>   (color)
#  linewidth | lw <1.. 6>   (size)
#  pointsize | ps <1..  >   (size)
#
plot "data" with linesp lt 3 lw 3 ps 3
reset
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pt 0

Sans les points.

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#  linetype  | lt <0..15>   (color)
#  linewidth | lw <1.. 6>   (size)
#  pointsize | ps <1..  >   (size)
#
plot "data" with linesp lt 3 lw 3 ps 3 pt 0
reset
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Commandes générales

set zeroaxis lt 8 lw 3

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#  linetype  | lt <0..15>   (color)
#  linewidth | lw <1.. 6>   (size)
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set zeroaxis lt 8 lw 3
plot sin(x),\
     cos(x)
reset
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set grid lt 8 lw 3

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#  linetype  | lt <0..15>   (color)
#  linewidth | lw <1.. 6>   (size)
#  pointsize | ps <1..  >   (size)
#
set grid lt 8 lw 3
plot sin(x),\
     cos(x)
reset
# ---------------------

Pour éviter la déformation du graphe :

set size ratio -1

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#  linetype  | lt <0..8>   (color)
#  linewidth | lw <1..6>   (size)
#
set size ratio -1
plot [-5.:5] [-1:1]\
     cos(x) lt 8 lw  6,\
     sin(x) lt 7 lw  6
reset
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complet

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#  linetype  | lt <0..15>   (color)
#  linewidth | lw <1.. 6>   (size)
#  pointsize | ps <1..  >   (size)
#
set zeroaxis lt 8 lw 3
set grid 
plot [-6.:6.] [-1.4:1.4]\
     sin(x),\
     cos(x)
reset
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En pratique

Les premières commandes pour dessiner des fonctions en 3d.

splot[x][y][z] (La fonction)

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reset
splot [0:2*pi][0:2*pi][-1:1]\
cos(x)*cos(y)
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set hidden (Faces cachées)

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reset
set hidden
splot [0:2*pi][0:2*pi][-1:1]\
cos(x)*cos(y)
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set view rot_x, rot_z, scale, scale_z (Imposer une vue)

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reset
set hidden
set view 55.,57.,  1., 1. 
splot [0:2*pi][0:2*pi][-1:1]\
cos(x)*cos(y)
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set xlabel "X axis" (Nommer les axes)

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#
reset
set hidden
set xlabel "X axis"
set ylabel "Y axis"
set view 55.,57.,  1., 1. 
splot [0:2*pi][0:2*pi][-1:1]\
cos(x)*cos(y)
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