IDL Kernel Demo¶

This notebook demostrates the current capability of the IDL IPython/Jupyter Kernel

Basic Input & Output¶

In [1]:

a = 1
b = 2
arr = indgen(5)
str = "Hello, World!"
help,a,b,str,arr

A               INT       =        1
B               INT       =        2
STR             STRING    = 'Hello, World!'
ARR             INT       = Array[5]

In [2]:

print,str

Hello, World!

Defining Functions & Procedures¶

In [3]:

FUNCTION mysin, x
    return, sin(x)
END

In [4]:

print, mysin(2)

     0.909297

In [5]:

PRO hello_world
    print,"Hello, World!"
END

In [6]:

hello_world

Hello, World!

Inline Plots (X Window System)¶

Note that X Window System may not work on a cloud platform such as mybinder.org:

In [7]:

;;This enables inline plotting
!inline=1

In [8]:

set_plot,'x'
x = 2*!PI*0.01*indgen(100)
y1 = sin(x)
y2 = cos(x)
device,decomposed=0 ;;colors will be numbers from 0 to 255, as index in a colortable
loadct,39 ;; only useful if decomposed=0 : this is the colortable chosen.
;; Note: if, as is the default, decomposed=1, colors are way more numerous (16777216!)
;; but must be defined as 'RRGGBB'x where each color component
;; (Red,Green,Blue) can take the 256 values from '00' to 'FF'
window,xsize=800,ysize=500
plot,x,y1,title='Trig Functions',xtitle='Radians',ytitle='Amplitude',xrange=[0,6],charsize=1.5,back=255,color=0
;; the equivalent in 'decomposed mode' would have said: background='FFFFFF'x,color='0'x
oplot,x,y2,color=50

Inline Plots (Z-buffer Pseudo Device)¶

In Z-buffer Device, you may need to choose decomposed=1 to use it on a cloud platform such as mybinder.org:

In [7]:

;;This enables inline plotting
!inline=1

In [8]:

set_plot,'z'
device,decomposed=1, set_resolution=[800,500],set_pixel_depth=24 ;;colors will be numbers from 0 to 255, as index in a colortable
x = 2*!PI*0.01*indgen(100)
y1 = sin(x)
y2 = cos(x)
loadct,14 ;; only useful if decomposed=0 : this is the colortable chosen.
;; Note: if, as is the default, decomposed=1, colors are way more numerous (16777216!)
;; but must be defined as 'RRGGBB'x where each color component
;; (Red,Green,Blue) can take the 256 values from '00' to 'FF'
plot,x,y1,title='Trig Functions',xtitle='Radians',ytitle='Amplitude',xrange=[0,6],charsize=1.5,background='000000'x,color='FFFFFF'x
;; the equivalent in 'decomposed mode' would have said: background='FFFFFF'x,color='0'x
oplot,x,y2,color='FF0000'x

Pixel Depth changes ignored in GDL, stays at 24.

If the plot does not work, you need to compile snapshot.pro by giving the correct path as follows:

In [10]:

.compile ~/snapshot.pro

In [ ]: