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Diffstat (limited to 'matlab.html.markdown')
| -rw-r--r-- | matlab.html.markdown | 58 |
1 files changed, 39 insertions, 19 deletions
diff --git a/matlab.html.markdown b/matlab.html.markdown index d9a82890..9de41275 100644 --- a/matlab.html.markdown +++ b/matlab.html.markdown @@ -15,10 +15,12 @@ If you have any feedback please feel free to reach me at ```matlab % Comments start with a percent sign. -%{ Multi line comments look +%{ +Multi line comments look something like -this %} +this +%} % commands can span multiple lines, using '...': a = 1 + 2 + ... @@ -40,36 +42,41 @@ ctrl-c % Abort current computation edit('myfunction.m') % Open function/script in editor type('myfunction.m') % Print the source of function/script to Command Window -profile viewer % Open profiler +profile on % turns on the code profiler +profile of % turns off the code profiler +profile viewer % Open profiler -help command % Displays documentation for command in Command Window -doc command % Displays documentation for command in Help Window -lookfor command % Searches for a given command +help command % Displays documentation for command in Command Window +doc command % Displays documentation for command in Help Window +lookfor command % Searches for command in the first commented line of all functions +lookfor command -all % searches for command in all functions % Output formatting -format short % 4 decimals in a floating number -format long % 15 decimals -format bank % only two digits after decimal point - for financial calculations -fprintf +format short % 4 decimals in a floating number +format long % 15 decimals +format bank % only two digits after decimal point - for financial calculations +fprintf('text') % print "text" to the screen +disp('text') % print "text" to the screen % Variables & Expressions -myVariable = 4 % Notice Workspace pane shows newly created variable +myVariable = 4 % Notice Workspace pane shows newly created variable myVariable = 4; % Semi colon suppresses output to the Command Window -4 + 6 % ans = 10 -8 * myVariable % ans = 32 -2 ^ 3 % ans = 8 +4 + 6 % ans = 10 +8 * myVariable % ans = 32 +2 ^ 3 % ans = 8 a = 2; b = 3; 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') +load('myFile.mat', 'y') % arguments within parantheses, spererated by commas % Command syntax: -load myFile.mat y % no parentheses, and spaces instead of commas +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 receive output: -[V,D] = eig(A) % this has no equivalent in command form +[V,D] = eig(A); % this has no equivalent in command form +[~,D] = eig(A); % if you only want D and not V @@ -85,7 +92,7 @@ load myFile.mat y % no parentheses, and spaces instead of commas % Logicals can be applied to matrices: A > 5 % for each element, if condition is true, that element is 1 in returned matrix -A[ A > 5 ] +A( A > 5 ) % returns a vector containing the elements in A for which condition is true % Strings @@ -100,6 +107,10 @@ a = {'one', 'two', 'three'} a(1) % ans = 'one' - returns a cell char(a(1)) % ans = one - returns a string +% Structures +A.b = {'one','two'}; +A.c = [1 2]; +A.d.e = false; % Vectors x = [4 32 53 7 1] @@ -160,6 +171,10 @@ A(1,:) % All columns in row 1 % 4 5 42 % 7 8 9 +% this is the same as +vertcat(A,A); + + [A , A] % Concatenation of matrices (horizontally) %ans = @@ -168,6 +183,8 @@ A(1,:) % All columns in row 1 % 4 5 42 4 5 42 % 7 8 9 7 8 9 +% this is the same as +horzcat(A,A); A(:, [3 1 2]) % Rearrange the columns of original matrix @@ -180,10 +197,13 @@ A(:, [3 1 2]) % Rearrange the columns of original matrix size(A) % ans = 3 3 A(1, :) =[] % Delete the first row of the matrix +A(:, 1) =[] % Delete the first column of the matrix +transpose(A) % Transpose the matrix, which is the same as: +A one ctranspose(A) % Hermitian transpose the matrix % (the transpose, followed by taking complex conjugate of each element) -transpose(A) % Transpose the matrix, without taking complex conjugate + |