echo off

clear all;
close all;
home


echo on

%to run matlab: execute "matlab" on linux.andrew.cmu.edu
pause;

clc
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%  Getting around  						%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%for help topics: "help"
pause;
help 
pause;

%help on specific topic lists available commands: "help <topic>"
pause;
help strfun
pause

%help on the command: "help <command>"
pause;
help hex2num
pause

%help on help: "help help"
pause;
help help
pause

%to see available matlab demos: help demos
pause;
help demos
pause;

%to clear screen: "clc"
pause;
clc
pause;

%working with directories: ls, pwd, cd ...
pause;
ls
pause;

%to execute shell command: !command
pause;
!mem
pause;

clc;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%  Working with variables  			%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%all variables are vectors and matrices
%creating x as a row vector

x = [1 2 3 5]
pause;


%creating x as a column vector

x = [1; 2; 3; 5]
pause;


%creating x as a column vector using transpose operator

x = [1 2 3 5]'
pause;


%not to print the result of operation: put ; at the end

y = [1; 2; 3; 5];
pause;

clc;
%to see all the variables

who
pause;

%to print the value of any variable: type the name of the variable

x
pause;

%to access individual elements (matlab uses 1-based index)

x(2)
pause;

%to access a range of elements

x(2:4)
pause;

clc
%to save ALL variables into a file

save mydata.mat;
ls
pause;


%to clear a variable from the memory

clear y;
who
pause;


%to clear all variables from the memory

clear;
who
pause;


%to load a file with variables

load mydata.mat;
who
pause;


%to save specific variables

save -ascii x.mat x;
ls
pause;
!more x.mat
pause;

clc;
%to load a delimited file (relevant for hw2)

y = dlmread('x.mat', ' ')
pause;

clc;
%% to create a matrix

B = [1 2 3; 4 5 6]
pause;


%accessing elements of B
%the order is RC (row column)

B(1,2)
pause;


%accessing rows/columns

B(:,1)
pause;


%accessing ranges of elements

B(2,1:2)
pause;


%accessing a set of specific elements

ind = [1 3];
B(2,ind)
pause;

%overwriting elements

B(2,1:2) = [8 9]
pause;

clc;
%creating vectors using [from:incr:to]

x = [1:0.1:2]

y = [5:-1:0]
pause;


%creating vectors using zeros and ones

x = zeros(2,2)

y = 3*ones(3,2)
pause;

%size of a matrix

size(y)

x = ones(size(y))
pause;

clc;
% maximum and minimum for each column

x = [1:1:4; 7:1:10]
max(x)
min(x)
max(max(x))
pause;

% summations for each column

sum(x)
sum(sum(x))
pause;

clc;
%identity matrix

E = eye(2,2)
pause;

clc;
% basic operations for element by element: use "."

A = [1 2; 4 5]
B = [2 2; 3 3]

C = A.*B
pause;

C = C./B
pause;

C = 3*A
pause;

C = A/3
pause;

%power 
C = A.^3
pause;

%power 
C = exp(A)
pause;


clc;
% basic operations on matrices

A = [1 2; 4 5]
B = [2 2; 3 3]

C = A+B
pause;

C = A*B
pause;

%inverse of A

C = inv(A)
pause;

%transpose of A

C = A'
pause;


clc
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%  Strings       						%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%strings are treated as arrays
s1 = 'hello'

s1(1:4)
pause;

%to print use fprintf(FILEID, string with format, variables);
%FILEID = 1 -> on screen

fprintf(1, 's = %s\n', s1);
pause;

clc;
%to print into file
fid1 = fopen('temp.txt', 'w');
fprintf(fid1, 'A(1,2) = %d \n', A(1,2));
fclose(fid1);
!more temp.txt
pause;


clc;
%for more help with strings: help strfun



clc
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%  Few statistics commands         %%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%generating uniform iid values from 0 to 1

A = rand(2)
pause;

%generating normal iid values from N(0,1)

A = randn(1,10)
pause;

%reset the seeds for rand and randn generators

rand('state',sum(100*clock));
randn('state',sum(100*clock));
pause;

clc;
%PDFs and CDFs: help pdf and help cdf for supported distributions
x = [-2:0.25:2];
f = pdf('Normal',x,0,1)
pause;

F = cdf('Normal',x,0,1)
pause;

f = pdf('Uniform',x,-2,2)
pause;

F = cdf('Uniform',x,-2,2)
pause;



clc
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%  Plotting 					         %%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%use plot function

x = [-2:0.25:2];
y = pdf('Normal',x,0,1);
plot(x,y);
pause;

clc;
%to open or switch to another figure: figure(x)

figure(2);
y = pdf('Uniform',x,-2,2);
plot(x,y);
pause;

clc;
%put a grid on top of the window

figure(1);
grid;
figure(2);
grid;
pause;

clc;
%plotting on top of existing graph will override unless "hold on" is set

figure(1);
hold on;
y = cdf('Normal',x,0,1);
plot(x,y, '*');
figure(2);
hold on;
y = cdf('Uniform',x,-2,2);
plot(x,y, '*');
pause;


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%  For the rest of useful things in matlab
%%  see matlab help (concise and helpful), 
%%  matlab tutorials on the web, matlab demos
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


echo off