MATLAB Onramp

x = pi

Create variables with the equal sign (=).

The left-side (x) is the variable name containing the value on the right-side (pi).

y = sin(-5)

You can provide inputs to a function using parentheses.

save

save data.mat

Save your current workspace to a MAT-file.

load

load data.mat

Load the variables in a MAT-file to the Workspace.

clear

clear

Clear all variables from the Workspace.

clc

clc

Clear all text from the Command Window.

format

format long

Change how numeric output is displayed.

4

scalar

[3 5]

row vector

[1;3]

column vector

[3 4 5;6 7 8]

matrix

1:4

Create a vector from 1 to 4, spaced by 1, using the colon (:) operator.

1:0.5:4

Create a vector from 1 to 4, spaced by 0.5.

linspace(1,10,5)

Create a vector with 5 elements. The values are evenly spaced from 1 to 10.

rand(2)

Create a square matrix with 2 rows and 2 columns.

zeros(2,3)

Create a rectangular matrix with 2 rows and 3 columns.

A(end, 2)

Access the element in the second column of the last row.

A(2,:)

Access the entire second row

A(1:3,:)

Access all columns of the first three rows.

A(2) = 11

Change the value of the second element an array to 11.

[1 1; 1 1]*[2 2;2 2]

ans =

        4 4

        4 4

Perform matrix multiplication.

[1 1; 1 1].*[2 2;2 2]

ans =

        2 2

        2 2

Perform element-wise multiplication.

[xrow, xcol] = size(x)

Save the number of rows and columns in x to two different variables.

[xMax, idx] = max(x)

Calculate the maximum value of x and its corresponding index value.

doc randi

Open the documentation page for the randi function

plot(x,y,"ro-","LineWidth",5)

Plot a red (r) dashed (--) line with a circle (o) marker, with a heavy line width.

hold on

Add the next line to existing plot.

hold off

Create a new axes for the next plotted line.

title("My Title")

Add a label to a plot.

data.HeightYards

Extract the variable HeightYards from the table data.

data.HeightMeters = data.HeightYards*0.9144

Derive a table variable from existing data.

[5 10 15] > 12

Compare a vector to the value 12.

v1(v1 > 6)

Extract all elements in v1 that are greater than 6.

x(x==999) = 1

Replace all values in x that are equal to 999 with the value 1.

if x > 0.5

    y = 3

else

    y = 4

end

If x is greater than 0.5, set the value of y to 3.

Otherwise, set the value of y to 4.

for c = 1:3

      disp(c)

end

The loop counter (c) progresses through then values 1:3 (1, 2, and 3).

The loop body displays each value of c.