## MATLAB FAQs

The most frequently asked questions about MATLAB and Simulink

#### Data Import and Analysis

- How do I find the indices of the maximum (or minimum) value of my matrix?
- How can I import data from .csv file with numeric values and texts (with column headers) into MATLAB Workspace?
- how to import csv file in matlab
- Print a statement to the Command Window
- How can I export a matrix as a CSV file?
- How to display a string and matrix in MATLAB?
- Save data to .txt file
- RMSE - Root mean square Error
- How can I create animated GIF images in MATLAB ?
- To find the maximum value in a matrix?
- energy concentration in time frequency distribution

#### Graphics: Basics

- How can I insert a title over a group of subplots?
- Adding vertical line to plot?
- How do I change the font size for text in my figure?
- How do I skip items in a legend?
- How do I plot a circle with a given radius and center?
- how to set a marker at one specific point on a plot (look at the picture)?
- sine wave plot
- TeX (LaTeX math mode) symbols in legends and labels in MATLAB figures
- How would I open multiple figures from one script.
- Add various horizontal lines to a plot
- Input a variable into a plot title
- How do I combine multiple plots in one graph?
- How do I control axis tick labels, limits, and axes tick locations?
- How do I add a title to each subplot?
- How to plot multiple lines in a graph?

#### Graphics: Objects

- How to change figure size?
- How do I plot lines with different line widths?
- how to set y-axis as log scale?
- How to change the line width for fplot?
- How do I change the marker size for a plot?
- How do I change the font size in my legend?
- How do I extract data from MATLAB figures?
- How do I make a figure full screen programmatically in MATLAB?
- how to set graph size
- change the font size of the current axis
- How to make figure window change size
- How can I change the font size of plot tick labels?

#### Installation and Licensing

- Why do I receive License Manager Error -8?
- Why do I receive License Manager Error -9?
- What is a Host ID? How do I find my Host ID in order to activate my license?
- Why do I receive License Manager Error -15?
- Why do I get License Manager Error -96?
- Why do I get a connection error when installing or activating MATLAB or another MathWorks product?
- How do I activate MATLAB or other MathWorks Products?
- How do I install additional toolboxes into an existing installation of MATLAB?
- How do I find my user name in order to install or activate my license?
- Where can I find the Activation Key and File Installation Key (FIK) for my license?
- Why do I receive License Manager Error -4?
- Why do I receive License Manager Error -95?
- How do I launch MATLAB on Linux?
- Where are the license files for MATLAB located?
- How can I install MATLAB or other MathWorks products on an offline machine?
- How can I get MATLAB installation files for use on an offline machine?
- How can I determine what add-ons I have installed?
- How do I update my MATLAB license file for an Individual or Designated Computer license?

#### Language Fundamentals: Basics

- How to convert a 1x1 cell to a string?
- How to get 'type' of a variable in matlab?
- Why do I get the error "Undefined function or variable"?
- How do I create a for loop in MATLAB?
- Cell conversion to double
- How can I remove NaN values from a matrix?
- How do I comment out a large block of code in MATLAB?
- How to convert a matrix of double to int?
- "double" vs. "uint8" input using "imshow" function
- How do I change the number display from scientific notation to the full number in digits?
- Do while loop in Matlab

#### Language Fundamentals: Matrices and Arrays

- delete element from vector
- Why do I get the error 'Subscript indices must either be real positive integers or logicals. ' ?
- Add SINGLE element to array or vector
- Count number of specific values in matrix
- convert matrix in single column
- How do you initialize an N*M matrix?
- Find closest value in array
- Append rows at the end of Matrix
- Adding elements to an array
- How to add elements to the end of an array?
- How to remove zeros from an array?
- How can I count the occurrences of each element in a vector in MATLAB?
- extract first row from matrix
- How to specifically select columns in a data matrix?
- Index in position 2 exceeds array bounds (must not exceed 1) ??
- FAQ: How can I create variables A1, A2,...,A10 in a loop?

#### Language Fundamentals: Operators and Elementary Operations

- Find index of cells containing my string
- “if” statement using “or” operator.
- How I can find index of element in array?
- How to use not equal to '~=' operator in if statement?
- Using AND Operator in “if” statements
- check whether a number belongs to an array or not
- how to find out if a number is even or not
- How to find the position of a number in an array?

#### Mathematics

### Additional Resources

#### MATLAB Onramp

Learn the essentials of MATLAB® through this free, two-hour introductory tutorial on commonly used features and workflows.

#### Documentation

All MATLAB® functions have supporting documentation that includes examples and describes the function inputs, outputs, and calling syntax.

#### Support

Online support for MATLAB, Simulink, and other MathWorks products. Access documentation, examples, solutions to common issues, and community forums.