# Athul Prakash

### MathWorks

I am an Associate Application Support Engineer at MathWorks.

My areas of interest are Deep Learning and Computer Vision.

DISCLAIMER: The advice and opinions here are my own and not in any way that of MathWorks.

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**Content Feed**

How to plot confusion matrix for 2 classes (genuine or fraud)

Hi Tam, First, you may set aside some of your data as test data. With this test dataset, obtain Y_Actual as the labels and X...

plus d'un an ago | 0

How do I create a simulator to scan a matrix and switch some of the elements in it?

Hi Eason, Using a filter along with conv2 should work, for example.. % It may be easier to store a logical array inp = (ra...

plus d'un an ago | 0

| accepted

Reducing script repetitiveness and length

Hi Daniel, Your code doesn't seem extra complicated. Writing each plot after each calculation is one way to keep things simple...

plus d'un an ago | 0

.MAT FILES AND WRITING CODE TO ANALYSE THE .MAT FILES

Hi Caroline, You may consider using struct arrays to group your data, and save everything to one file as a simplification. % C...

plus d'un an ago | 0

| accepted

How to extract rows and columns of matrix that will not equal to 0.

Hey Teb. When programming in MATLAB, it is best to avoid for loops and vectorize the code as far as possible. If you have F=A...

plus d'un an ago | 0

How can I know if the repeated numbers of array A appear in B , and if so count their repetition (for A and B ) and divide their countings? A and B have different dimensions.

Hi Ana, You may extract the common elements of the array using intersect() function. common = intersect(mag_a, mag_b); Then...

plus d'un an ago | 0

| accepted

Householder Algorithm finding Q

Hi Frederick, You may prefer the MATLAB built-in qr() function. [Q,R] = qr(M); See this documentation: https://in.mathwo...

plus d'un an ago | 0

BSXFUN Vectorizing. How can I vectorize the function?

Hi Iman, bsxfun intends to apply @plus to elements of same index across the two input arrays. So in your call to bsxfun, the di...

plus d'un an ago | 0

How do I weight input data when training a neural network?

Hi Cai, I can think of a few ideas, you may need to experiment with these to find what works.. Once the network is trained ...

plus d'un an ago | 0

Reading data from large .CSV files

Hi there, The use of a datastore is what comes to mind at first - you could try using read to obtain a chunk of data at once a...

plus d'un an ago | 0

| accepted

How To Find the Euler Angles(Roll,Pitch,Yaw) of a Plane in 3D?

Hi Ercan, You mentioned that you have a plane equation of the form and wish to calculate the Euler angles. I presume you are r...

plus d'un an ago | 1

Create the following Matrix typing one command

Hi Jens, In MATLAB for entering matrix values, commas and spaces can be used (interchangeably) to separate values left to right...

plus d'un an ago | 0

Please write the c-code below in matlab.

Hey Attcharapan, I presume that you're trying to do somethign similar to the Sieve of Erastosthenes alrogithm and find prime nu...

plus d'un an ago | 0

feature vector of NN

You can extract the network and inputs from the 'results' struct using.. net = results.net inputs = results.inputs I found ...

plus d'un an ago | 0

| accepted

Response must not contain any NaNs??

Hi Sho, NaN is a special floating-point value which is used as a placeholder in cases where a 'double' type number was expected...

plus d'un an ago | 1

| accepted

Importing EEG edf to matlab

Hi Mubeen, I presume you're using the pro_biosig.m file found here: https://github.com/donnchadh/biosig/blob/master/biosig/eegl...

plus d'un an ago | 0

Terminating function call with CTRL-C but keep the main function working

Hi Adrian, I can't think of a straightforward solution, since MATLAB doesn't allow you to programmatically trigger a Ctrl+C ; n...

presque 2 ans ago | 0

How can i solve this? Subscripted assignment dimension mismatch

The error message indicates that you may be assigning an array of values but the sizes of the arrays on the left and right of '=...

presque 2 ans ago | 0

| accepted

Plot Results of objective function in fmincon

Hi Amanuel, @optimplotfval is designed to plot the output of the Objective Function against the number of iterations. In you...

presque 2 ans ago | 2

How to use IF with @(block_struct) function

Hi Saud, Since blockproc uses anonymous functions, you may save your multi-line function into a script, say myFunc.m and then p...

presque 2 ans ago | 0

| accepted

How do I find the given eigenvectors

I presume that you've obtained these eigenvalues by calling the 'eig' function in MATLAB. You may try calling the same with a se...

presque 2 ans ago | 0

Row index exceeds table dimensions.

If you could attach the input file, others users may actually run the code with that data and witness the exact error themselves...

presque 2 ans ago | 0

Looping vector values into functions

Saving multiple variables with names 'n1', 'n2', etc may be a bad practice, I would recommend using a vector 'n' with indices 1-...

presque 2 ans ago | 0

Help with simple ANN for data prediction

If you're looking to pick up how Neural Networks are handled in Matlab, I would suggest going through some of the examples in th...

presque 2 ans ago | 0

Array not positive real value?

As others have pointed out, this error message typically occurs when you're indexing an array with incompatible values (usually ...

presque 2 ans ago | 0

How to add a column in MATLAB after sorting an array

Hi Sukalyan, Looking at your figure, I assume that the data is a table existing in the workspace and that you've already sorted...

presque 2 ans ago | 0

Combinations of values in vectors

Hi Davide, To answer both your questions.. a) I'm assuming that you don't want to specify 'lam' in the code (along with the i...

presque 2 ans ago | 0

Include several folders into path using Matlab Engine for Python

Hi Davide, If you're in MATLAB at the command line, you may use genpath and addpath as follows to add a folder 'myOuterFolder'...

presque 2 ans ago | 1

Solved

Find relatively common elements in matrix rows

You want to find all elements that exist in greater than 50% of the rows in the matrix. For example, given A = 1 2 3 5 ...

presque 2 ans ago

Solved

QWERTY coordinates

Given a lowercase letter or a digit as input, return the row where that letter appears on a <http://en.wikipedia.org/wiki/Keyboa...

presque 2 ans ago