Matlab quiz one through plots | Quizlet

Error icon

Shows where code is invalid

Array

orderly arrangement of numbers, terms, or symbols. (Columns and rows)

Square Brackets

How you create an array.

ex y = [7 9] creates the array 7 9

also called a row vector

Row vector

Array with one row and multiple columns

[ ; ] (square brackets separating data with semicolons)

creates a column vector

y = [7;9] produces

7

9

Matrix

Made with a combonation of rows and column's

Ex: c = [ 5 6 7; 8 9 10]

creates

5 6 7

8 9 10

:

colon is how you create evenly spaced row vectors

1:9 creates

1 2 3 4 5 6 7 8 9

more practial for larger rows

How to change spacing when using a colon :

add step inbetween

Ex 22:2:26 would produce

22 24 26

If you know the number elements instead of the spacing use what command

linspace(starting number, ending number, number of elements)

How to convert linspace and : into columns instead of rows?

Use ' at the end

Ex linspace(1, 5, 3)'

rand(row, column) command

creates random matrices of random numbers, number in parentheses denotes how large it is

Ex rand(5) creates a 5 by 5 matrix

How to create a matrix of certain numbers

use the number in place of rand

ex. zeros(3, 2)

0 0 0

0 0 0

How to extract a single data point from a matrix

variable = datafilename(row, column)

End

Refers to last row or column

: when extracting data points

When x = data(:, 2)

The colon refers to all the elements in the second column

So it will extract a whole row or a whole column

Or it can set a range

ex y = data(:, end-1:end) extract's the last two columns of data

How to change a single number in a matrix

dataname(element location) = new value

Getting max and mins

max(dataname)

.*

Preforms element wise multiplication

Size function

Tells you rows and columns in a data set

You can also define rows and columns

Ex [r, c] = size(data) will produce r = # of rows and c = # of columns

How to create a random matrix with min and max numbers and a specific amount of rows and columns

Variable name = randi([lowest number, highest number], number of rows, number of columns)

Hold on command

Plots two functions on the same graph

Plot(x, y, "specifications")

Hold on

Plot(x, y, "specifications")

Hold off

Plots no longer on the same graph

Vector plotting with line width

Plot(y, linewidth = #)