MATLAB commands in numerical Python (NumPy)
MATLAB commands in numerical Python (NumPy)
Vidar Bronken Gundersen /mathesaurus.
MATLAB commands in numerical Python (NumPy)
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Copyright ?????
Vidar Bronken Gundersen
Permission is granted to copy, distribute and/or modify this document as long as the above attribution is kept and the resulting work is distributed under a license identical to this one.
The idea of this document (and the corresponding xml instance) is to provide a quick reference? for switching from matlab
to an open-source environment, such as Python, Scilab, Octave and Gnuplot, or R for numeric processing and data visualisation.
Where Octave and Scilab commands are omitted, expect Matlab compatibility, and similarly where non given use the generic command.
Time-stamp: ????-??-??T??:??:?? vidar
1
Help
Desc.
Browse help interactively
Help on using help
Help for a function
Help for a toolbox/library package
Demonstration examples
Example using a function
1.1
R
help.start()
help
help(plot) or ?plot
help(pylab)
help()
help(plot) or ?plot
help(package=¡¯splines¡¯)
demo()
example(plot)
matlab/Octave
lookfor plot
Python
help
which plot
help(); modules [Numeric]
help(plot)
R
help.search(¡¯plot¡¯)
apropos(¡¯plot¡¯)
library()
find(plot)
methods(plot)
matlab/Octave
Octave: octave -q
Octave: TAB or M-?
foo(.m)
Octave: history
diary on [..] diary off
exit or quit
Python
ipython -pylab
TAB
execfile(¡¯foo.py¡¯) or run foo.py
hist -n
matlab/Octave
help -
Python
Using interactively
Desc.
Start session
Auto completion
Run code from file
Command history
Save command history
End session
2
Python
help()
Searching available documentation
Desc.
Search help files
Find objects by partial name
List available packages
Locate functions
List available methods for a function
1.2
matlab/Octave
doc
Octave: help -i % browse with Info
help help or doc doc
help plot
help splines or doc splines
demo
CTRL-D
CTRL-Z # windows
sys.exit()
R
Rgui
source(¡¯foo.R¡¯)
history()
savehistory(file=".Rhistory")
q(save=¡¯no¡¯)
Operators
Desc.
Help on operator syntax
R
help(Syntax)
? References: Hankin, Robin. R for Octave users (????), available from (accessed ????.??.??); Martelli, Alex. Python in a Nutshell (O¡¯Reilly, ????);
Oliphant, Travis. Guide to NumPy (Trelgol, ????); Hunter, John. The Matplotlib User¡¯s Guide (????), available from (accessed ????.??.??); Langtangen, Hans Petter. Python
Scripting for Computational Science (Springer, ????); Ascher et al.: Numeric Python manual (????), available from (accessed ????.??.??); Moler, Cleve. Numerical
Computing with MATLAB (MathWorks, ????), available from (accessed ????.??.??); Eaton, John W. Octave Quick Reference (????); Merrit, Ethan. Demo scripts for
gnuplot version 4.0 (????), available from (accessed ????.??.??); Woo, Alex. Gnuplot Quick Reference (????), available from
(accessed ????.??.??); Venables & Smith: An Introduction to R (????), available from (accessed ????.??.??); Short, Tom. R reference card (????), available
from (accessed ????.??.??).
1
MATLAB commands in numerical Python (NumPy)
Vidar Bronken Gundersen /mathesaurus.
2.1
Arithmetic operators
Desc.
Assignment; defining a number
Addition
Subtraction
Multiplication
Division
Power, ab
matlab/Octave
a=1; b=2;
a + b
a - b
a * b
a / b
a .^ b
Remainder
rem(a,b)
Integer division
In place operation to save array creation
overhead
Factorial, n!
2.2
a %% b
a %/% b
Octave: a+=1
a+=b or add(a,b,a)
factorial(a)
factorial(a)
matlab/Octave
a == b
a < b
a > b
a = b
a ~= b
Python
a == b or equal(a,b)
a < b or less(a,b)
a > b or greater(a,b)
a = b or greater_equal(a,b)
a != b or not_equal(a,b)
R
a == b
a < b
a > b
a = b
a != b
matlab/Octave
a && b
a || b
a & b or and(a,b)
a | b or or(a,b)
xor(a, b)
~a or not(a)
Octave: ~a or !a
any(a)
all(a)
Python
a and b
a or b
logical_and(a,b) or a and b
logical_or(a,b) or a or b
logical_xor(a,b)
logical_not(a) or not a
R
a && b
a || b
a & b
a | b
xor(a, b)
!a
matlab/Octave
sqrt(a)
log(a)
log10(a)
log2(a)
exp(a)
Python
math.sqrt(a)
math.log(a)
math.log10(a)
math.log(a, 2)
math.exp(a)
R
sqrt(a)
log(a)
log10(a)
log2(a)
exp(a)
Logical operators
Desc.
Short-circuit logical AND
Short-circuit logical OR
Element-wise logical AND
Element-wise logical OR
Logical EXCLUSIVE OR
Logical NOT
True if any element is nonzero
True if all elements are nonzero
2.4
R
a ................
................
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