# Drishan Poovaya

### MathWorks

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I am an intern at Mathworks. My responsibility is to provide the best support for applications like Image Processing, and Signal Processing. Disclaimer: Any articles /ideas/opinions here are my own and in no way reflect that of Mathworks

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Solved

Calculate the mean of each half of a matrix

Given a matrix with an even number of columns, n, return a 1-by-2 row vector where the first element is the mean of all the elem...

22 days ago

Solved

Find Closest Constant

Given a number x, return the value that is closest to x from this list of constants: 0, 1, , e, , (also known as ). For exampl...

22 days ago

Solved

Matrix Quadrants

Write a function that takes N as the input, and outputs a matrix whose upper-left (NxN) quadrant contains all ones, the lower-ri...

22 days 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...

2 years ago

Solved

Finding Perfect Squares

Given a vector of numbers, return true if one of the numbers is a square of one of the numbers. Otherwise return false. Example...

2 years ago

Solved

Maximum value in a matrix

Find the maximum value in the given matrix. For example, if A = [1 2 3; 4 7 8; 0 9 1]; then the answer is 9.

2 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 ...

2 years ago

How to use optimization in matlab?

Hi, It appears you want to find the maximum area of a rectangle with sides A and B, such that A + B = Lt. This would assume tha...

2 years ago | 0

| accepted

Subplot for individual for loop angle

Hi, the reason the graph isn't being plotted the way you expect is because your nested for loop structure is incorrect for thi...

2 years ago | 1

| accepted

How do I display a figure from another section again?

Hi, Essentailly, you want to display a figure which you had previously created in a different section again. You can use the sa...

2 years ago | 0

| accepted

Surrounding elements in an array affect and change an element over a loop.

Hi, Essentially you want to check all elements in the neighbourhooud of a particualr element but you want the search to wrap a...

2 years ago | 0

what is the mistake i am doing here? i have to plot the three equations f,f1,f2

Hi, It appears you are trying to plot symbolic functions. This is not what plot3 is designed to do, it can only plot numerical ...

2 years ago | 0

Plot 2 Tangent Lines in a function

Hi Please have a look at the code snippet below. It calculates the tanget at points 1 and 5 and plots the tangents. Keep in min...

2 years ago | 0

How to find the maximum of some variables ?

You can refer to the function below, it solves your issue function dispwithname(varargin) [~, idx] = max([varargin{:}]); disp...

2 years ago | 0

Combining video files in matlab

You can use while loops with the "hasFrame" check to write each frame of each video to the new file. Below is an example with tw...

2 years ago | 0

Multi- App/Class GUI with app designer

I understand that you essentially want to combine 3 .mlapp files into one GUI. Unfortunately this is not possible. Each mlapp fi...

2 years ago | 0

| accepted

How to extract HOG and EHD features from '.txt' files?

Hi, The first step would be to import the txt file into MATLAB. You can do so in 2 ways. Use the Import Data optiom in the va...

2 years ago | 0

| accepted

How can I show two points value in a wave?

A simple workaround is, first right click the scope output and select 'Print display to figure'. Now you can simply click on p...

2 years ago | 0

Morse Decoder with Character Counter

Hi, First of all, there are a few errors with your userMorse variable. Every time you have typed "..--.-", which indicates a '-...

2 years ago | 0

App Designer as Inputs to Separate Object Oriented Code

Hi, it is possible to do this without using app-designer. You can get this behaviour by using UIFigure components. In the link ...

2 years ago | 0

Display both the figure and save the output in the function 'findchangepts'

Currently findchangepts does not support this feature. I have brought this issue to the notice of the concerned people and it mi...

3 years ago | 1

| accepted

Creating multiple axis scales on one axis - Ex: fixed step, logarithmic, fixed step

It is possible to have multiple scales on one axis, but it is a little lenghty. Please have a look below t = tiledlayout(1,3,'T...

3 years ago | 1

How to write function for panel in App Designer?

You can access the panel a button was present in using the Parent property. Firstly, give each panel an appropriate title in t...

3 years ago | 0

3D Graph (bar3?) with two vectors and one matrix

As per my understanding, you will not get the type of output you want with bar3. Refer to the documentation of bar3 https://www...

3 years ago | 0

Error Message: Undefined function, App Designer

The reason this error is occuring is that, while you have created both time and power variables, they are at the moment local to...

3 years ago | 0

Lock axis for Rotate3D

It is not possible to lock specific axis for rotate3D. However there is a workaround using the rotate function, using which you ...

3 years ago | 1

| accepted

Find the local and global maxima and minima

One option is to use ‘findpeaks’ in the Signal Processing Toolbox. It will give you the maximum (and indirectly the minimum) val...

3 years ago | 1