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Get professional help for Matlab programming assignments for any academic level: from basic right up to advanced Matlab projects. **MATLAB**, also referred to as **Matrix Laboratory**, is a robust computing language developed by **MathWorks**. It is a visual oriented software that doubles up as a **fourth generation programming language**. Problems and solutions in MATLAB are represented mathematically. The array, which is the fundamental data element in MATLAB, does not require any dimensioning. Hence, solving matrix and vector formulas are much easier in MATLAB as compared to scalar non-interactive languages like Fortran or C. **Matlab also facilitates function and data plotting, algorithm implementation, user interface creation and linking with applications that have been written in other languages like C, C++, Java & Python.**

Click here to **download the 30 day trial version of Matlab**. The latest version of Matlab, as we write this article, is **Matlab R2019b**.

**Matlab has an interesting history**. The development of MATLAB started in the late 1970s by **Cleve Moler** who was the chairman of the **University of New Mexico** computer science department. His goal, while developing MATLAB was to provide students with access to **LINPACK** and **EISPACK** who had no prior knowledge of Fortran. As a result, it soon gained popularity within the students of applied mathematics and started spreading to other universities. During the same time, Moler’s visit to **Stanford University** exposed MATLAB’s potential to an engineer named **Jack Little**. Jack understood the impact that this computer language could have commercially and went on to form MathWorks in 1984. He joined Moler and **Steve Bangert** and rewrote the application in C. The libraries that were rewritten came to be known as **JACKPAC**. Newer set of libraries that were aimed at manipulating matrices were rewritten in 2000.

The usage of MATLAB spans across a wide variety of fields in engineering, science and economics. It has more than 3 million users that rely on it for solving data and computing challenges every day.

**It is used in the following environments:**

**Embedded Systems:**These are computer systems that combine hardware and software components to perform a particular task. Embedded Systems include devices like printers, cameras and washing machines. MATLAB has the capability to generate code that can run on hardware.**Control Systems:**A control system manages, executes commands and regulates the behavior of other systems. These systems can range from controlling simple devices like home heaters to complex industrial machine processes. MATLAB’s control systems toolbox helps in fine-tuning and devising control systems by providing algorithms and applications to analyze and design them**Wireless Communication:**It includes the infrastructure that is required to connect two devices using wireless signal. MATLAB helps engineers in reducing development time and helps to rectify and remove problems related to design. It also helps in testing and verifying products.

The MATLAB scripting language is used extensively inside the core application. The Command Window inside the MATLAB application is used to execute text files that consist of codes. Syntax in MATLAB can be broken down into the following concepts, which include:

**Variables:**A variable in MATLAB is an array or matrix. A variable stores values that can be used and referred later. Values are assigned to the variables using the ‘=’ operator and should have a name.**Vectors and Matrices:**They produce a singular multidimensional signal by combining separate scalar data. It helps in creation of row matrix/vector, creation of column matrix or vector, transposing matrix and accessing elements within a vector or matrix**Structures:**MATLAB includes different types of structural data. Referred to as a structure array, it is used to group similar and related information using data containers, which are referred to as, fields. A field can contain any type of data. Data in a field can be accessed by using the form ‘structure.fieldname.’**Functions:**These are groups of statements that collectively execute a task. Functions are stored and defined in separate files and are case sensitive. Hence, the name of the function and the file should be the same. They can accept more than one input argument and can return multiple output arguments.**Function Handles:**Through function handles, MATLAB supports lambda calculus. They are implemented in .m files or nested functions.

- Monte-Carlo:If sample sizes are increasing generate largest size first in a vector and use increasingly larger portions for calculations. Saves time and memory.
- Trick: If you have a program that takes a long time to run and does not use all of the CPU/memory, split it into more programs and run using different workers (instances).
- Matlab is a column vector based language. Load memory columnwise first always. For faster code also preallocate memory for variables, Matlab requires contiguous memory usage. Matlab uses copy-on-write, so passing pointers (adresses) to a function will not speed it up. Change variable class to potentially save memory (Ram) using:int8, int16, int32, int64, double, char, logical, single
- You can turn the standard (mostly) Just-In-Time compilation off using: feature accel off. You can use compiled (c,c++,fortran) functions using MEX functions.
- Avoid global variables, they are user-error prone and compilers cant optimize them well.
- Functions defined in a .m file is only available there. Preface function names with initials to avoid clashes, eg.MrP function1.
- Graphic cards(GPU)’s have many (small) cores. If (1) program is computationally intensive (not spending much time transfering data) and (2) massively parallel, so computations can be independent. Consider using the GPU!
- Using multiple cores (parallel computing) is often easy to implement, just use parfor instead of for loops.
- Warnings: empty matrices are NOT overwritten ([] + 1 = []). Rows/columns are added without warning if you write in a nonexistent row/column. Good practise: Use 3i rather than 3*i for imaginary number calculations, because i might have been overwritten by earlier. 1/0 returns inf, not NaN. Dont use == for comparing doubles, they are floating point precision for example: 0.01 == (1 − 0.99) = 0.

Disclaimer:* All of the above information has been shared from publicly available sources for information only. All copyrights acknowledged. *

format short Displays 4 digits after 0 format long Displays 15 digits after 0 disp(x) Displays the string x disp(x) Displays the string x num2str(x) Converts the number in x to string num2str([’nA is = ’ OFTEN USED! num2str(a)]) ! mat2str(x) Converts the matrix in x to string int2str(x) Converts the integer in x to string sprintf(x) formated data to a string

addpath(string) adds path to workspace genpath(string) gets strings for subfolders pwd Current directory mkdir Makes new directory tempdir Temporary directory inmem Functions in memory exit Close matlab dir list folder content ver lists toolboxes

xlsread/xlswrite Spreadsheets (.xls,.xlsm) readtable/writetable Spreadsheets (.xls,.xlsm) dlmread/dlmwrite text files (txt,csv) load/save -ascii text files (txt,csv) load/save matlab files (.m) imread/imwrite Image files

keyboard Pauses exceution return resumes exceution tic starts timer toc stops timer profile on starts profiler profile viewer Lets you see profiler output try/catch Great for finding where errors occur dbstop if error stops at first error inside try/catch block dbclear clears breakpoints dbcont resume execution lasterr Last error message lastwarn Last warning message break Terminates executiion of for/while loop waitbar Waiting bar

for i=1:n procedure Iterates over procedure end incrementing i from 1 to n by 1 while(criteria) procedure Iterates over procedure end as long as criteria is true(1) if(criteria 1) if criteria 1 is true do procedure 1 procedure1 elseif(criteria 2) ,else if criteria 2 is true do procedure 2 procedure2 else , else do procedure 3 procedure3 end switch switch_expression if case n holds, case 1 run procedure n. If none holds procedure 1 run procedure 3 case 2 (if specified) procedure 2 otherwise procedure 3 end

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Please note: Your information is handled with utmost confidentiality. We never sell or share any information provided by you under any circumstances*.clc | Clear command window |

clear | Clear system memory |

clear x | Clear x from memory |

commandwindow | open/select commandwindow |

whos | lists data structures |

whos x | size, bytes, class and attributes of x |

ans | Last result |

close all | closes all gures |

close(H) | closes gure H |

winopen(pwd) | Open current folder |

class(obj) | returns objects class |

save filename | saves all variables to .mat le |

save filename x,y | saves x,y variables to .mat le |

save -append filename x | appends x to .mat le |

load filename | loads all variables from .mat le |

ver | Lists version and toolboxes |

beep | Makes the beep sound |

doc function | Help/documentation for function |

docsearch string | search documentation |

web google.com | opens the web adress |

inputdlg | Input dialog box |

methods(A) | list class methods for A |

distrnd | random numbers from dist |

distpdf | pdf from dist |

distcdf | cdf dist |

distrnd | random numbers from dist |

hist(x) | histogram of x |

histfit(x) | histogram and |

*Standard distributions (dist) | norm, t, f, gam, chi2, bino |

*Standard functions | mean,median,var,cov(x,y),corr(x, |

*quantile(x,p) is not textbook version. (It uses interpolation for missing quantiles. |

edit filename | Opens filename in editor |

Alt | Displays hotkeys |

F1 | Help/documentation for highlighted function |

F5 | Run code |

F9 | Run highlighted code |

F10 | Run code line |

F11 | Run code line, enter functions |

Shift + F5 | Leave debugger |

F12 | Insert break point |

Ctrl+Page up/down | Moves between tabs |

Ctrl+Shift | Moves between components |

Ctrl + C | Interrupts code |

Ctrl + D | Open highlighted codes le |

Ctrl + R/T+ | Comment/uncomment line |

Ctrl + N | New script |

Ctrl + W | Close script |

Ctrl+Shift+d | Docks window |

Ctrl+Shift+u | Undocks window |

Ctrl+Shift+m | max window/restore size |

abs(x) | absolute value |

pi | 3:1415::: |

inf | ∞ |

epf | floating point accuracy |

1e6 | 10^{6} |

sum(x) | sums elements in x |

cumsum(x) | Cummulative sum |

prod | product of array elements |

cumprod(x) | cumulative product |

diff | difference of elements |

round/ceil/fix/floor | Standard functions. |

*Standard functions: sqrt, log, exp, max, min, Bessel

*Factorial(x) is only precise for x < 21

A cell may contain any kind of variables

x=cell(a,b) | a b cell array |

x{n,m} | access cell n,m |

cell2mat(x) | transforms cell to matrix cellfun |

cellfun('fname',C) | Applies fname to cells in C |

strcomp | compare strings (case sensitive) |

strcompi | compare strings (not case sensitive) |

strncomp | as strcomp, but only n first letters |

strfind | find string within a string , gives start position |

regexp | Search for regular expression |

&& | short circuit AND. |

& | AND |

|| | short circuit or |

| | or |

~ | not |

== | equality comparision |

isa(obj, ’class_name’) | is object in class |

~= | not equal |

*Other logical operators: <,>,>=,<=

*All above operators are elementwise

*Class indicators: isnan, isequal, ischar, isinf, isvector , isempty, isscalar, iscolumn

*Short circuits only evaluate second criteria if

first criteria is passed, it is therefore faster.

And useful fpr avoiding errors occuring in second criteria

*non-SC are bugged and short circuit anyway

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