Differences

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--- software:gnuplot [2013/10/09 10:53]
cyril [Plot data from a file]
+++ software:gnuplot [2024/04/19 09:54] (current)
cyril autotitle
@@ Line 59: / Line 59: @@
 set x2label ""
 set y2label ""
+</code>
+  * Log scale.<code gnuplot>
+set logscale x 2
+set logscale y 10
 </code>
@@ Line 69: / Line 74: @@
 set key left bottom
 set key 100,100
+</code>
+  * Automatic legend.<code gnuplot>
+set key autotitle columnheader
 </code>
@@ Line 137: / Line 146: @@
   * **every** Specifying lines to use (every 2 lines from line 50 to line 1050).<code gnuplot>
 plot "data.dat" using 4:5 every 2::50::1050
+</code>
+  * **separator** Set the field separator:<code gnuplot>
+set datafile separator ","
 </code>
@@ Line 159: / Line 172: @@
 plot "data1.dat" using 4:5 lt rgb "red"
 plot "data1.dat" using 4:5 lt rgb "#FF0000"
+</code>
+  * **palette** Colors as value.<code gnuplot>
+set palette defined (0 "black", 1 "red")
+plot "data1.dat" using 1:2:0 w p palette
 </code>
@@ Line 190: / Line 208: @@
 </code>
-  * **($1)** Arithmetics on columns.<code gnuplot>
+  * **($1)** Arithmetics on columns data.<code gnuplot>
 plot "data1.dat" using 4:($5/2+14)
 # where $n means column n
+</code>
+  * **(column())** Arithmetics on columns indices.<code gnuplot>
+plot i=1, "data1.dat" using 1:(column(i+1))
 </code>
@@ Line 203: / Line 225: @@
 plot "gps.dat" using (rotation_x($3,$4)):(rotation_y($3,$4))
+</code>
+  * **word()** Define array variables.<code gnuplot>
+colors="red blue green"
+print word(colors,3)
 </code>
@@ Line 214: / Line 241: @@
 plot for [file in "run1.dat run2.dat run3.dat"] file using 1:2
 </code><code gnuplot>
-plot for [i=1:3] run.dat using i
+plot for [i=1:3] run.dat using i t sprintf("curve %s", columnheader(i))
 </code><code gnuplot>
 file(n) = sprintf("run_%d.dat",n)
@@ Line 277: / Line 304: @@
   * or anything else with shell commands...
+  * **fit** a function to data:<code gnuplot>
+f(x) = a*x**2 + b*x + c
+fit f(x) "file.dat" u 1:2 via a,b,c
+plot "file.dat" u 1:2, f(x)
+</code>
   * **sh** Passing arguments to a gnuplot script.
@@ Line 428: / Line 461: @@
 </code>
-  * Progressive display (but the plot is not really interactive anymore)<code gnuplot>
+  * Progressive display (but the plot is not interactive anymore)<code gnuplot>
 plot "file.dat" u 1
-while(1) { replot ; pause 0.1 }
+while(1) { replot ; pause 0.2 }
 </code>
-  * Pausing and resuming the progressive display for interactivity (only works with x11 terminal).<code gnuplot>
+  * Pausing and resuming the progressive display for interactivity (only works with x11 terminal if started in interactive gnuplot shell... for wxt terminal the event processing loop -- wxt_gui.cpp:wxt_waitforinput function -- is not called during the update loop, but ctrl-c in the shell stops the update loop and allows plot interactivity afterwards, contrary to x11 term...).<code gnuplot>
 set terminal x11
 bind "c" "update=1-update ; while(update) { replot ; pause 0.1 }"
 plot "file.dat" u 1
 update=1
-while(update) { replot ; pause 0.1 }
+while(update) { replot ; pause 0.2 }
 </code>