More MATLAB Basics: strings, mathematical operations, plotting

Strings

color1 = 'blue'

color2 = 'green'

text = 'to embed an apostrophe isn''t hard'

combo = [color2, '-', color1]

combo(length(combo) + 1) = 's'

ch = combo(7)

combo(7:end) = 'black'

Mathematical Operations on Vectors and Matrices

Arithmetic operators

+   -   *   /   ^   \

Operators use rules of linear algebra:

• for scalars, scalar arithmetic is done

   

• for matrices, matrix arithmetic is done

   

   

   

   

Element-wise operation

Basic Plotting

plot( xcoords, ycoords, 'spec' )

Example: plot y = 4x²cos(x) - 3x + 7 over the range x = 2 to 30

Example: plot the points (1,1), (3,4), (5,8), (2,9), (7,2)

Plotting multiple sets of data:

plot( xcoords1, ycoords1, 'spec1', xcoords2, ycoords2, 'spec2' )

Example: plot y = cos(x) and y = 0.5x² - 2x + 1 for x = 0 to 3π

Additional features:

• figure

• title('text')
• xlabel('label')
• ylabel('label')

• legend('curve1', curve2')

• text(x, y, 'text')

• axis( [ xmin, xmax, ymin, ymax ] )

• axis equal