Here we are going to tell you everything about Matlab commands. But before we get started. Let’s have an overview of Matlab. Matlab is designed for engineers and computer scientists; that is why it can be abbreviated as a Matrix-based programming language. Matlab offers excellent solutions to the various computational numeric calculations. It can utilize to:
- Development of algorithms.
- Data analysis.
- Creations of applications and models.
Matlab found to be a great use in case of in-depth learning and machine learning as this can deal with n-dimension space. These spaces can be used to analyze and represent the data into the matrix form. Besides this, there are several technologies that are using this technique for image processing, control system design, and computational finance.
Table of Contents
What are Matlab commands?
Matlab is used for interactive codes for data visualization and numerical computations. One can use different kinds of commands by typing them in Matlab prompt ‘>>’ on the shown command window.
In this post, you will get the list of different Matlab commands that are used for different purposes.
Matlab Commands for system working
Matlab offers several commands that are useful for system working, such as saving the work within the workspace as a loading file or as a file. It offers several Matlab commands for system-related work, such as listing files within the directory, displaying dates, displaying current directions, and much more. The table that is shown below has some Matlab commands that use for system-related work:
| Matlab Commands | Purpose |
| date | Show the current date. |
| diary | Switches off/on diary recording files. |
| load | Loads working variables within a file. |
| pwd | Show the current directory. |
| type | Show the contents of a specific file. |
| wklread | Reads .wk1 sheet file. |
| delete | Deletes a specific file. |
| cd | Alternating current directory. |
| dir | Lists required files in the current directory. |
| path | Shows the search path. |
| save | Saves work variables within a file. |
| what | Lists files within a current directory. |
Example 1
octave: 11> pwd
ans = /home/00
octave: 12> x = 3
x = 3
octave: 13> x = 4
x = 4
octave: 14> who
Variables in the current scope:
ans x
Example 2:
octave: 4> type y
y is variable
4
octave: 5> type x
x is a variable
3
Matlab commands in a session management
There are various Matlab commands that are used for managing a session. The table has offered all those commands:
| Matlab Commands | Purpose |
| clear | Clear variable from memory. |
| global | Represents variable to be universal. |
| lookfor | Researches help records for a given keyword. |
| who | List out all current variables. |
| clc | Clears window of command. |
| exist | Checks the existence of variable or file. |
| help | Look for a help topic. |
| quit | Stops MATLAB. |
| whos | Lists the current variables. |
Example 1:
octave: 15> x = 5
x = 5
octave: 16> y = 4
y = 4
octave: 17> who
Variables in the current scope:
ans x y
Example 2:
octave: 1> clear
octave: 2> type x
error: type: ‘x’ undefined
octave: 3> type y
error: type: ‘y’ undefined
Matrix, Vector, and Array Matlab commands
The given table will represent several commands that can be used for working with matrix, vector, and array:
| Matlab Commands | Purpose |
| find | Check indices of all nonzero components. |
| linspace | Creates a spaced vector regularly. |
| max | Returns the largest variable value. |
| prod | Product of every column. |
| size | Evaluate array size. |
| sum | Sums every column. |
| ones | Generate an array of each one. |
| cross | Executes cross products of a matrix. |
| det | Executes determinant of the given array. |
| pinv | Executes pseudoinverse of a given matrix. |
| rref | Executes reduced row echelon form. |
| cellplot | Shows graphical presentation of the cell array. |
| deal | Relate output and input lists. |
| cat | Use for concatenates arrays. |
| length | Counts the number of elements. |
| logspace | Generates spaced vector logarithmically. |
| min | Returns back the smallest element. |
| reshape | Modifications in size. |
| sort | Sorts every column. |
| eye | Generates an identity matrix. |
| zeros | Generate an array with zeros. |
| dot | Executes dot products of a matrix. |
| inv | Executes the inverse of a given matrix. |
| rank | Executes the rank of a given matrix. |
| cell | Generates the cell array. |
| celldisp | Show the cell array. |
| num2cell | Changes the numeric array into a cell array. |
| iscell | Identifies the cell array. |
Example1:
octave: 18> array1 = [4,5,6]
octave: 20> cat(4, array1)
ans =
4 5 6
octave: 21> length (array2)
ans = 3
octave: 22> max (cat (4, array1, array2))
ans =
7 8 9
octave: 23> max(array1)
ans = 3
octave: 18> min(array2)
ans = 7
Example 2:
Octave: 19> a = [1 2 3; 4 5 6; 7 8 9]
a =
1 2 3
4 5 6
7 8 9
octave: 20> b = [1 1 1; 0 0 0; 1 2 3]
b =
1 1 1
0 0 0
1 2 3
octave: 21> rank(a)
ans = 2
octave: 22> rank)b)
ans = 2
det(a)
ans = 6.6613e-16
octave: 23> det(b)
ans = 0
octave: 24> inv(a)
Warning: matrix singular to machine precision, rcond = 1.54198e-18
ans =
-4.5036e+15 9.0072e+15 -4.5036e+15
9.0072e+15 -1.8014e+16 9.0072e+15
-4.5036e+15 9.0072e+15 -4.5036e+15
Conclusion
Matlab can be used for high-level codings and scientific calculations that can be utilized for an interactive platform to execute complicated calculations in a more effective manner. Matlab commands use to support modules of different operations that are integrated with Simulink. Besides this, it uses for simulation the control system of electronics that can compute digital signal processing, video processing, numerical methods, image processing, and much more.
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