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%%% show image%
imshow(img);
%%% display multiple image in same window%
subplot(1,2,1),imshow(img1);
title('First Image');
subplot(1,2,2),imshow(img2);
title('Second Image');
%%% using figure%figure;
imshow(img);
Dimensions of Image
%%% get the dimensions of image% if img is colour image then dimension is vector with 3 elements% if img is grayscale image then dimension is vector wit 2 dimensions%
dimensions = size(img);
% number of rows
nr = dimensions(1);
% number of columns
nc = dimensions(2);
Image Type Conversion (Color Scale Conversion)
%%% Convert RGB image to colormap to gray scale image%
imgray = rgb2gray(imrgb);
%%% Convert grayscale or binary image to indexed image%
imind = gray2ind(imgray);
%%% Convert matrix to grayscale image%
imgray = mat2gray(A); % where A is a 2D matrix%%% Split multichannel image into its individual channels% eg. if you read an rgb image it has 3 color channel Red, Green & Blue% if one need to fetch individual channel from that you can use the following funtion%
[ r, g, b ] = imsplit(imrgb); % r contains red channel of image; g contains green channnel of image; b contains blue channel of image;
Graphs & Plots
%%% histogram plot of the gray scale image file%
imhist(imgray);
%%% bar chart%
X = [100,200,300,400,500,600,700]
Y = [3,6,9,12,15,18,21]
% plot X vs Y plot
bar(X,Y);
% plot X
bar(X)
%%% line plot%
X = linspace(-2*pi,2*pi,100);
Y = sin(X);
plot(X,Y); % plots X vs sin(X) plot
subplot(1,3,3),plot(X,Y1,X,Y2); % plots X vs sin(X) AND X vs cos(X) plot%%% Customize your plot%% give title of the plot
bar(X,Y);
title('My Data Plot');
% change the color of the plots% ------------------------------------------------------------------% | Short Name | Color Name | RGB Triplet | Hexadecimal Color Code |% ------------------------------------------------------------------% | 'r' | 'red' | [1 0 0] | '#FF0000' |% | 'g' | 'green' | [0 1 0] | '#00FF00' |% | 'b' | 'blue' | [0 0 1] | '#0000FF' |% | 'c' | 'cyan' | [0 1 1] | '#00FFFF' |% | 'm' | 'magenta' | [1 0 1] | '#FF00FF' |% | 'k' | 'black' | [1 1 0] | '#FFFF00' |% | 'w' | 'white' | [0 0 0] | '#000000' |% | 'y' | 'yellow' | [1 1 1] | '#FFFFFF' |% ------------------------------------------------------------------
bar(X,'r'); % this plots red coloured bar graph% plot X vs sin(X) AND X vs cos(X) plots
X = linspace(-2*pi,2*pi,100);
Y1 = sin(X);
Y2 = cos(X);
plot(X,Y1,X,Y2);
% give label to the plot
xlabel('-2\pi < X < 2\pi');
ylabel('Sine and Cosine Values');
% add legend to the plot
legend({'y = sin(x)','y = cos(x)'},'Location','northeast');
% change line style of the line graph% -------------------------------------------% | Value | Description |% -------------------------------------------% | '--' | Dashed line |% | '-' | Solid line (default) |% | ':' | Dotted line |% | '-.' | Dash-dot line |% -------------------------------------------
plot(X,Y1,'--'); % change line style to dashed line% change line markers of the line graph% -------------------------------------------% | Value | Description |% -------------------------------------------% | 'o' | Circle |% | '+' | Plus sign |% | 'x' | Cross |% | '*' | Asterisk |% | '.' | Dot |% | 's' | Square |% | 'd' | Diamond |% | 'p' | Pentagram (Five pointed star) |% | 'h' | Hexagram (Six pointed star) |% | '>' | Right pointing triangle |% | '<' | Left pointing triangle |% | '^' | Upward pointing triangle |% | 'v' | Downward pointing triangle |% -------------------------------------------
plot(X,Y1,'o'); % this shows the line in the form of sequence of small circles% combine multiple properties in one% shows dashed line with circle in red for sine plot and dashed line with cross in blue for cosine plot
plot(X,Y1,'--or',X,Y2,'--xb');
Declare Function
function [return_values1,...,return_valuesN] = function_name(parameter1,...,parameterN)%%% Body Here%%end
For Loop
% for loop from 1 - nfor i =1:n%%% Body Here%%endfor
While Loop
whilecondition%%% Body Here%%endwhile
If Condition
ifcondition%%% Body Here%%endif
Arithmatic Operations
%%% Addition%
a =3+5;
%%% Subtraction%
a =3-5;
%%% Multiplication%
a =3*5;
%%% Division%
a =3/5;
%%% Power%
a =3^5;
% OR
a = power(3,5);
%%% Logarithm%% Natural Log
a = log(3);
% Common Log
a = log10(3);
%%% Square Root%
a = sqrt(9);
Bitwise Logical Operations
%%% Logical - OR%
a = bitor(3,5);
%%% Logical - AND%
a = bitand(3,5);
%%% Logical - NOT%
a = bitnot(3,5);
%%% Logical - XOR%
a = bitxor(3,5);
Matrix Operations
%%% Declare Column Vector%
mat = [1; 2; 3];
%%% Declare Row Vector%
mat = [123];
% OR
mat = [1, 2, 3];
%%% Declare Matrix of m x n dimension%% 1 2 3% 4 5 6% 7 8 9%
mat = [123; 456; 789];
% OR
mat = [1, 2, 3; 4, 5, 6; 7, 8, 9];
%%% Fetch Elements From Matrix%% Fetch single element
a = mat(1,1);
% OR
a = mat(1); % numerical indexing starting from 1 in column major order% Fetch whole column
a = mat(:,1);
% Fetch whole row
a = mat(1,:);
% Fetch perticular part from matrix
a = mat(1:2,2:3);
%%% Find Dimension of Matrix%
dimension = size(mat);
%%% Declare Matrix with 1%% 1 0 0% 0 1 0% 0 0 1%
i_mat = eye(3);
% OR
i_mat = eye(3,3);
%%% Declare Matrix with 1%% 1 1 1% 1 1 1% 1 1 1%
i_mat = ones(3);
% OR
i_mat = ones(3,3);
%%% Declare Matrix with 0%% 0 0 0% 0 0 0% 0 0 0%
z_mat = zeros(3);
% OR
z_mat = zeros(3,3);
%%% Declare Magic Matrix%% 8 1 6 % 3 5 7% 4 9 2%
magic_mat = magic(3);
%%% Addition Operation on Matrix%% Add scalar value to an matrix
new_mat =mat+2; % new_mat & mat are two matrix of m x n size% Add matrix A with matrix B
new_mat =A+B; % new_mat, A & B are same dimension m x n matrix%%% Multiplication Operation on Matrix%% Multiply scalar value with matrix
new_mat =mat*2;
% Multiply matrix A with matrix B
new_mat =A*B; % dimension of matrix A: m1 x n | dimension of matrix B: n x m2 | dimension of matrix new_mat: m1 x m2% Multiply the corresponding elements of two matrices or vectors using the .* operator
new_mat =A.*B; % dimension of matrix A: m1 x n | dimension of matrix B: n x m2 | dimension of matrix new_mat: m1 x m2%%% Subtraction Operation on Matrix%% Subtract scalar value to an matrix
new_mat =mat-2; % new_mat & mat are two matrix of m x n size% Subtract matrix A with matrix B
new_mat =A-B; % new_mat, A & B are same dimension m x n matrix%%% Minimum Value%% Minimum of row or column vector
min_value = min(vector);
% Minimun of m x n matrix
min_value_vector = min(mat); % using min() on any matrix return vector containing minimum of each column
min_value = min(min_value_vector);
%%% Maximum Value%% Maximum of row or column vector
max_value = max(vector);
% Maximun of m x n matrix
max_value_vector = max(mat); % using max() on any matrix return vector containing maximum of each column
max_value = max(max_value_vector);
%%% Median Value%% Median of row or column vector
median_value = median(vector);
% Median of m x n matrix
median_value_vector = median(mat); % using median() on any matrix return vector containing median of each column
median_value = median(median_value_vector);
