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插入 gnuplot 程序

1. 配置好 gnuplot，可以正常使用 set terminal png 这条命令
2. 需要加入下面的代码，使得可以运行 gnuplot

   ;; active Babel languages
   (org-babel-do-load-languages
   'org-babel-load-languages
   '((gnuplot . t)))
   ;; add additional languages with '((language . t)))
       

3. 插入 gnuplot 函数代码

   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
       

x	y1	y2
0.1	0.425	0.375
0.2	0.3125	0.3375
0.3	0.24999993	0.28333338
0.4	0.275	0.28125
0.5	0.26	0.27
0.6	0.25833338	0.24999993
0.7	0.24642845	0.23928553
0.8	0.23125	0.2375
0.9	0.23333323	0.2333332
1	0.2225	0.22

set title "Putting it All Together"
set xlabel "X"
set xrange [0:1]
set xtics 0,0.1,1

set ylabel "Y"
set yrange [0.2:0.5]
set ytics 0.2,0.05,0.5


plot data u 1:2 w p lw 2 title 'x vs. y1', \
data u 1:3 w lp lw 1 title 'x vx. y2'
  

运行 python 程序

1. :session [name] :default is no session
2. :var data=data-table 可以从表中选择数据
3. :exports {code,results,both,none} 选择以什么方式导出
4. example

   a	1
   b	2
   c	3

   # Return row specified by val.
   # In non-session mode, use return to return results.
   return(data[val])
       

   import matplotlib, numpy
   matplotlib.use('Agg')
   import matplotlib.pyplot as plt
   fig=plt.figure(figsize=(4,2))
   x=numpy.linspace(-15,15)
   plt.plot(numpy.sin(x)/x)
   fig.tight_layout()
   plt.savefig('image/org/python-matplot-fig.png')
   return 'image/org/python-matplot-fig.png' # return filename to org-mode
       

easy templates

s	#+BEGIN_SRC ... #+END_SRC 
e	#+BEGIN_EXAMPLE ... #+END_EXAMPLE
q	#+BEGIN_QUOTE ... #+END_QUOTE 
v	#+BEGIN_VERSE ... #+END_VERSE 
c	#+BEGIN_CENTER ... #+END_CENTER 
l	#+BEGIN_LaTeX ... #+END_LaTeX 
L	#+LaTeX: 
h	#+BEGIN_HTML ... #+END_HTML 
H	#+HTML: 
a	#+BEGIN_ASCII ... #+END_ASCII 
A	#+ASCII: 
i	#+INDEX: line 
I	#+INCLUDE: line

setting picture size

1. first need to disable below function # -*- org-image-actual-width: nil; -*-
2. above the picture add below #+ATTR_foo: :width 500px

Keybindings

key	description
C-c C-x C-v	display inline picture
C-c C-l	Insert link
C-c C-x C-l	display Latex equation

Bugs

1. 加入 org-babel-load-languages 依然出现错误,无法编译程序
   • 此时需要删除 org mode 的 elc 文件
   • cd /Users/haomiao/.emacs.d/elpa/org-20170210
   • rm *.elc
   • C-u 0 M-x byte-recompile-directory