Primitive Variables

Numbers

Number type variables store numeric values. By default a numeric variable in Matlab is stored as a double. All Matlab values are seen as arrays. Even if just assign on number it is seen as a 1 value Array.

%Assigning a variable
aVariable=3
%Multiple assignements
variableOne=1; variableTwo=2; variableThree=3;

%Assigning an int
anInt=int16(3)

%Matlab as in-built complex numbers
aComplex=3+5i;
anotherComplex=3+5j %Using i or j as the imaginary key is the same.

%Get real part of a complex number
realPart=real(aComplex)
%Get imaginary part of a complex number
imaginaryPart=imag(aComplex)

%Operations are done as a normal operations is a calculator

%Sum
exampleSum=5+3
%Subtraction
exampleSubtraction=5-3
%Division
exampleDivision=5/3
%Multiplication
exampleMultiplication=5*3
%Power
examplePower=5^3
%Square Root
exampleSqrt=sqrt(5)

%If you forget your variables you can look at the variables space 
%or perform the command who
who; %This command will list the variables! Try it!
%If you want some more detail about the variables  you can perform whos
whos; %Try it yourself :)

Strings

In Matlab we create stings just by using ' '. If you remember Matlab sees all variables as arrays. This way a String is seen as an array of Chars(Characters).

% assigning to a string variable
aChar = '3'  
aString = '333333'


coolString = 'The quick brown fox jumped over the lazy dog'

% get string length (number of characters)
length = length(coolString)  % 44

% Matlab slices use (start:stop)
% Remember, Matlab index starts with 1. 
index1 = coolString(1)  % the letter 'T'
index6 = coolString(6)  % the letter 'u'

lastChar = coolString(length(coolString))  % the letter 'g'

coolSlice = coolString(5:23)  % the string 'quick brown fox jum'

coolSliceFromStart = coolString(:23)  % the string 'The quick brown fox jum'

coolSliceToEnd = coolString(4:length(coolString))  % 'quick brown fox jumped over the lazy dog'

pointlessSlice = coolString(:)  % the original string

%concatenation of strings
pp = 'pen pineapple'
ap = 'apple pen'
concatenation = strcat(pp,ap) %pen pineapple apple pen