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Explain difference between command and function syntax

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James Scott-Brown 2013-09-18 18:05:29 +01:00
parent 3eb4dbab9a
commit 4ddcd660f8
1 changed files with 15 additions and 2 deletions
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matlab.html.markdown
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@ -37,8 +37,8 @@ clc % Erases the writing on your Command Window
diary % Toggle writing Command Window text to file diary % Toggle writing Command Window text to file
ctrl-c % Abort current computation ctrl-c % Abort current computation
edit('myfunction.m') % Open function in editor edit('myfunction.m') % Open function/script in editor
type('myfunction.m') % Print the source of function to Command Window type('myfunction.m') % Print the source of function/script to Command Window
profile viewer % Open profiler profile viewer % Open profiler
@ -62,6 +62,17 @@ myVariable = 4; % Semi colon suppresses output to the Command Window
a = 2; b = 3; a = 2; b = 3;
c = exp(a)*sin(pi/2) % c = 7.3891 c = exp(a)*sin(pi/2) % c = 7.3891
% Calling functions can be done in either of two ways:
% Standard function syntax:
load('myFile.mat', 'y')
% Command syntax:
load myFile.mat y % no parentheses, and spaces instead of commas
% Note the lack of quote marks in command form: inputs are always passed as
% literal text - cannot pass variable values. Also, can't reveive output:
[V,D] = eig(A) % this has no equivalent in command form
% Logicals % Logicals
1 > 5 % ans = 0 1 > 5 % ans = 0
10 >= 10 % ans = 1 10 >= 10 % ans = 1
@ -384,8 +395,10 @@ NaN
inf inf
% Solving matrix equations (if no solution, returns a least squares solution) % Solving matrix equations (if no solution, returns a least squares solution)
% The \ and / operators are equivalent to the functions mldivide and mrdivide
x=A\b % Solves Ax=b. Faster and more numerically accurate than using inv(A)*b. x=A\b % Solves Ax=b. Faster and more numerically accurate than using inv(A)*b.
x=b/A % Solves xA=b x=b/A % Solves xA=b
inv(A) % calculate the inverse matrix inv(A) % calculate the inverse matrix
pinv(A) % calculate the pseudo-inverse pinv(A) % calculate the pseudo-inverse