add gnuplot examples

lisp/my/my-org-article.org

@@ -581,6 +581,78 @@ digraph G {
 #+RESULTS:
 [[file:img/figure-dot.png]]
 
+*** gnuplot
+
+=gnuplot-inline-display-mode=
+=gnuplot-dedicated-display-mode=
+=gnuplot-external-display-mode=
+
+#+begin_src gnuplot :results silent
+reset
+
+set title "Putting it All Together"
+
+set xlabel "X"
+set xrange [-8:8]
+set xtics -8,2,8
+
+
+set ylabel "Y"
+set yrange [-20:70]
+set ytics -20,10,70
+
+f(x) = x**2
+g(x) = x**3
+h(x) = 10*sqrt(abs(x))
+
+plot f(x) w lp lw 1, g(x) w p lw 2, h(x) w l lw 3
+#+end_src
+
+*** gnuplot gantt chart
+#+tblname: gantt-table
+| Task           | Effort | Start           | End              | Who |
+|----------------+--------+-----------------+------------------+-----|
+| Time available |      1 | <2020-11-02 Mo> | <2020-11-13 Fr>  |     |
+| Task 0         |      2 | <2020-11-03 Di> | [2020-11-05 Thu] | Al  |
+| Task 1         |      1 | <2020-11-05 Do> | <2020-11-06 Fr>  | Bo  |
+| Task 2         |      3 | <2020-11-05 Do> | [2020-11-10 Di]  | Ca  |
+| Task 3         |      2 | <2020-11-06 Fr> | <2020-11-10 Di>  | Ca  |
+| Task 4         |      2 | <2020-11-06 Fr> | <2020-11-06 Fr>  | Bo  |
+| Task 5         |      1 | <2020-11-10 Di> | <2020-11-10 Di>  | Bo  |
+| Task 6         |      1 | <2020-11-11 Mi> | <2020-11-12 Do>  | Bo  |
+| Task 7         |      2 | <2020-11-09 Mo> | <2020-11-10 Di>  | Al  |
+| Task 8         |      1 | <2020-11-12 Do> | <2020-11-12 Do>  | Al  |
+| Task 9         |      1 | <2020-11-06 Fr> | <2020-11-09 Mo>  | Al  |
+| Task 10        |      1 | <2020-11-12 Do> | <2020-11-13 Fr>  | Bo  |
+| Task  11       |      1 | <2020-11-13 Fr> | <2020-11-13 Fr>  |     |
+
+#+begin_src gnuplot :results silent :var DATA=gantt-table :results graphics
+reset
+# http://gnuplot.sourceforge.net/demo_5.1/gantt.html
+OneMonth = strptime("%m","2")
+OneWeek = strptime("%U","2")
+OneDay = strptime("%d","2")
+timeformat = "%Y-%m-%d %a"
+T(N) = timecolumn(N,timeformat)
+
+set xdata time
+set format x "%a\n%d\n%b\n'%y"
+set xtics OneDay nomirror
+set xtics scale 2, 0.5
+set mxtics 7
+
+skiptorow=2
+set yrange [(skiptorow-2):] reverse
+set ytics nomirror
+
+unset key
+set title "{/=15 My Project}"
+set grid x y
+set border 3
+set style arrow 1 nohead filled size screen 0.02, 15 fixed lt 3 lw 8
+
+plot DATA using (T(3)) : ($0) : (T(4)-T(3)) : (0.0) : yticlabel(1) with vector as 1
+#+end_src
 
 ** Example / Verbatim
 #+BEGIN_EXAMPLE