Summary of MATLAB Onramp

Basic Syntax

Example	Description
`x = pi`	Create variables and assign values with the equal sign (`=`). The left side (`x`) is the variable name, and the right side (`pi`) is its value.
`y = sin(-5)`	Provide inputs to a function using parentheses.

Desktop Management

Function	Example	Description
`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 appears in the Command Window.

Array Types

Example	Description
`4`	scalar
`[3 5]`	row vector
`[1;3]`	column vector
`[3 4 5; 6 7 8]`	matrix

Evenly Spaced Vectors

Example	Description
`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](https://www.mathworks.com/help/matlab/ref/linspace.html)(1,10,5)`	Create a vector with `5` elements. The values are evenly spaced from `1` to `10`.

Matrix Creation

Example	Description
`[rand](https://www.mathworks.com/help/matlab/ref/rand.html)(2)`	Create a square matrix with `2` rows and `2` columns.
`[zeros](https://www.mathworks.com/help/matlab/ref/zeros.html)(2,3)`	Create a rectangular matrix with `2` rows and `3` columns of `0`s.
`[ones](https://www.mathworks.com/help/matlab/ref/ones.html)(2,3)`	Create a rectangular matrix with `2` rows and `3` columns of `1`s.

Array Indexing

Example	Description
`A([end](https://www.mathworks.com/help/matlab/ref/end.html),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 of an array to `11`.

Array Operations

Example	Description
[1 2; 3 4] + 1 ans = 2 3 4 5	Perform array addition.
[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.

Multiple Outputs

Example	Description
`[xrow,xcol] = [size](https://www.mathworks.com/help/matlab/ref/size.html)(x)`	Save the number of rows and columns in `x` to two different variables.
`[xMax,idx] = [max](https://www.mathworks.com/help/matlab/ref/max.html)(x)`	Calculate the maximum value of `x` and its corresponding index value.

Documentation

Example	Description
`[doc](https://www.mathworks.com/help/matlab/ref/doc.html) randi`	Open the documentation page for the `randi` function.

Plots

Example	Description
`[plot](https://www.mathworks.com/help/matlab/ref/plot.html)(x,y,"ro--","LineWidth",5)`	Plot a red (`r`) dashed (`--`) line with a circle (`o`) marker, with a heavy line width.
`[hold](https://www.mathworks.com/help/matlab/ref/hold.html) on`	Add the next line to the existing plot.
`hold off`	Create new axes for the next plotted line.
`[title](https://www.mathworks.com/help/matlab/ref/title.html)("My Title")`	Add a title to a plot.
`[xlabel](https://www.mathworks.com/help/matlab/ref/xlabel.html)("x")` `[ylabel](https://www.mathworks.com/help/matlab/ref/ylabel.html)("y")`	Add labels to axes.
`[legend](https://www.mathworks.com/help/matlab/ref/legend.html)("a","b","c")`	Add a legend to a plot.

Tables

Example	Description
`[data.HeightYards](https://www.mathworks.com/help/matlab/matlab_prog/access-data-in-a-table.html)`	Extract the variable `HeightYards` from the table `data`.
data.HeightMeters = data.HeightYards*0.9144	Derive a table variable from existing data.

Logical Indexing

Example	Description
`[[5 10 15] > 12](https://www.mathworks.com/help/matlab/matlab_prog/array-comparison-with-relational-operators.html)`	Compare the elements of a vector to the value `12`.
`[v1(v1 > 6)](https://www.mathworks.com/help/matlab/matlab_prog/find-array-elements-that-meet-a-condition.html)`	Extract all elements of `v1` that are greater than `6`.
`x(x==999) = 1`	Replace all values in `x` that are equal to `999` with the value `1`.

Programming

Example	Description
if x > 0.5 y = 3 else y = 4 end	If `x` is greater than `0.5`, set `y` to `3`. Otherwise, set `y` to `4`.
for c = 1:3 disp(c) end	The loop counter (`c`) progresses through the values `1:3` (`1`, `2`, and `3`). The loop body displays each value of `c`.