# Siddharth Shankar

### MathWorks

Professional Interests: Software development, GUI building, Instrument Control, Data Acquisiton

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**Content Feed**

Submitted

Two Port S-Parameter Measurement

Perform a 2-port s-parameter measurement using the Instrument Control Toolbox.

5 years ago | 16 downloads |

Why does Stateflow evaluate the condition [x >= (1/2)] differently from [x >= 0.5]?

If I had to guess, I would think that 1/2 results in integer division which always yields 0, and this is then cast to double (0....

9 years ago | 1

| accepted

How to activate Stateflow substate without flow graph

Can you please expand on the question a bit? It would help if you could sketch out a very simple example example with maybe jus...

9 years ago | 1

Solved

Find all elements less than 0 or greater than 10 and replace them with NaN

Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

9 years ago

Solved

Column Removal

Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; and ...

9 years ago

Solved

Select every other element of a vector

Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

9 years ago

Solved

Determine if input is odd

Given the input n, return true if n is odd or false if n is even.

9 years ago

Solved

Make the vector [1 2 3 4 5 6 7 8 9 10]

In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

9 years ago

Solved

Find the sum of all the numbers of the input vector

Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

9 years ago

Solved

Times 2 - START HERE

Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

9 years ago

How to find number of arrays in a structure filed ?

Off the top of my head: function [N1, N2] = fieldCount(inputStruct) N1 = 0; N2 = 0; for i = 1: numel(inputStruct) i...

10 years ago | 0

| accepted

How to react on a change of variable from workspace?

One POSSIBLE solution if you are not considering a _timer_ object (and assuming that you have a relatively recent version of MAT...

10 years ago | 4

| accepted

Declaring 'many' variables from work space into function workspace

A very simple (but effective) way to do this is to use EVALIN to save the necessary variables in the base workspace to a MAT fil...

10 years ago | 8

Writing Non-ASCII keys in Serial Port

The value for CTRL-Z (^Z), is 26 (decimal value). So you could just try using FWRITE to send that value, in addition to all the ...

10 years ago | 1

| accepted

Store and read MAT-file as embedded file in an Excel spreadsheet

If you are familiar with C++, then you could consider using the <http://www.mathworks.com/help/techdoc/apiref/bqoqnz0.html#bqoqn...

10 years ago | 0

How do I creating a database of image files that is accessible from MATLAB?

You could store the image data into a database as a BLOB (Binary Large Object). I know you can do this in MySQL, you need to che...

10 years ago | 1

Frequency modulating a wav file?

If simulink is an option, the <http://www.mathworks.com/help/toolbox/commblks/ref/fmmodulatorpassband.html FM Modulator Passband...

10 years ago | 0

calling Java methods using JNI/C++ (via Swig) from Matlab -> UnsatisfiesLinkError

Please try adding the path to the C++ library inside the file: librarypath.txt 1. From the MATLAB command prompt: edit lib...

10 years ago | 1

How can I convert a MATLAB file into a .exe file ?

You can do this using the <http://www.mathworks.com/products/compiler/ MATLAB Compiler>. The executable created needs to be pack...

10 years ago | 0

How to replace "getsnapshot" with the button on my webcam?

What you are asking for is a "hardware trigger". You could check if your VIDEOINPUT object supports hardware triggers by using t...

10 years ago | 1

MATLAB GUI

As Matt mentioned, UITABLE wasn't really supported/documented till R2008a and was not (in 7a) nearly as powerful as it is today....

10 years ago | 1

How to replace MATLAB icon from a figure window?

As Bruno says, that would be a breach of the MathWorks license agreement. Specific details here: <http://www.mathworks.com/su...

10 years ago | 3

Read Data from Serial Device

Douglas, I would recommend adding a call to FLUSHINPUT (if you are using the Instrument Control Toolbox) as soon as you FOPEN...

10 years ago | 0

Image Background Removal

Have you considered using the <http://www.mathworks.com/help/toolbox/images/ref/imabsdiff.html imabsdiff> method. The difference...

10 years ago | 0

Saving a Bilevel - or Binary Image

B = zeros(X, Y, 1, NumberOfFrames); B = logical(B); is what you are looking for. More info here: <http://www.mathworks.com...

10 years ago | 0

Motion detection using image subtraction.

<http://www.mathworks.com/company/newsletters/news_notes/win03/tracking.html Tracking Objects> Look at the section titled: "O...

10 years ago | 0

| accepted

Creating a gui with variable axes

As far as "variable axes" goes, one approach you could take is to "link" your data to the axes. Then, when you change the data, ...

10 years ago | 0