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# Ramnarayan Krishnamurthy

### MathWorks

28 total contributions since 2017

Customer Success Engineer @ MathWorks
Professional Interests: Computational Thinking, Teaching, Image Processing, Data Science
Personal Interests: Books, Sports, Adventure and Photography

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Find the sum of the elements in the "second" diagonal
Find the sum of the elements in the diagonal that starts at the top-right corner and ends at the bottom-left corner.

11 months ago

Answered
how to compare elements in an array respectively
If I understand correctly, you are comparing the arrays element wise and then deciding based on a condition. One approach could ...

11 months ago | 1

Answered
How i can write glcm features in matlab to excel sheet?
I would suggest using "writetable" and setting the "WriteVariableName" argument to false to accomplish this. For example: Assu...

11 months ago | 0

Answered
How to retrieve table data based on matched variable
You are correct in that you can use logical indexing to solve this without loops. Here is a possible approach: % Extract logica...

11 months ago | 1

Submitted

Code Examples from "Video Processing in MATLAB"
Demos from the Video introducing Video Processing in MATLAB

1 year ago | 66 downloads |

Answered
How to append lines to an existing MessageBox
The following is a possible approach to append messages in the msgbox after its creation. % Create a message box h = msg...

2 years ago | 0

Answered
Testing Data for Power Law Relationship
*Part 1:* A few possible approaches to approaching this is as follows: *a) Without the Curve Fitting Toolbox* i) _Using po...

2 years ago | 0

| accepted

Answered
How to read xlsx file after the date
A possible approach would be to pull out the date from the file name and then sort it. Then, keep a track of the order and read ...

2 years ago | 0

Answered
Setdiff with two datasets, looking at only certain columns
You can use the ' |setdiff|' and ' |intersect|' functions with logical indexing to get the output you desire. As an example: ...

2 years ago | 0

| accepted

Answered
How to modify a variable with a gui?
In the callback function for the button, use the |assignin| function to modify the value in the base workspace. For ex. ...

2 years ago | 0

Answered
Comparison for/vectorization- some general advice
The result you observe could be because preallocation the second time appears to be faster than the first. So, timing each allo...

2 years ago | 0

| accepted

Answered
How can I do a loop to extract vectors from a matrix?
The reason only the last one is stored at the end of the for loop is that 'c' is being overwritten each time the loop iterates. ...

2 years ago | 1

Answered
Splitting array based on a single column's condition
If the transition point in the fourth column is known to be 0, then you can consider splitting the data by the location of these...

2 years ago | 0

| accepted

Answered
How do I change the yaxis exponent when using a double y-axis plot?
Try setting the exponent as follows: ax.YAxis(2).Exponent=3; instead of ax.YAxis.Exponent = 3; This sets the expo...

2 years ago | 2

Answered
Plot surface with 3 vectors x,y,z?
Did you try plot3 or scatter3? If you are looking to simply "plot" the 1000 points where the triplet (x,y,z) represents a poi...

2 years ago | 0

Answered
I don't find the error in my function, (index exceed matrix dimensions)?
I am assuming that you are calling the function with vector arguments such as: Azimuth([10,20],[30,40]). Now, there is an ex...

2 years ago | 0

Answered
bar and histograms for categorical data
MATLAB by default places categories in alphabetical order. One of the possible approaches to switching the order of the bars is...

2 years ago | 0

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Answered
Plot a signal, manually brush data range, and generate new variable
To programmatically implement selecting brush data, saving it to a newly created variable, you can try the following approach: ...

2 years ago | 1

Answered
Improving circle detection with imfindcircle
The following link may have some useful tips on circle detection using *imfindcircles* and *regionprops*: <https://www.mathwo...

2 years ago | 0

Answered
'Plots' not a recognized parameter in deep learning network training
This may be MATLAB version related. Which version of MATLAB are you trying to execute this on? The ability to monitor trainin...

2 years ago | 1

| accepted

Answered
How can I get the histeq function to ignore NaN values?
It appears that MATLAB warns you about using *histeq* on a matrix with NaNs and replaces them to 0. I would suggest the follo...

2 years ago | 0

Answered
Photogrammetry, distance in image
A possible approach would be to use the function 'regionprops' after some basic pre-processing: I = imread('edges.png...

2 years ago | 0

| accepted

Answered
How should I denoise the image to extract the characters from the image?
A possible approach to solve the above problem is as follows: % Read in the image Iin = rgb2gray(imread('test.png')); ...

2 years ago | 0

Answered
Detect Edge in picture with low contrast
The image would need pre-processing before passing it to one of the edge detectors. I would suggest trying to enhance the contr...

2 years ago | 1

Answered
How to set a variable network name for CNNs with trainNetwork
When you use: [networkName, trainInfo] = trainNetwork(myData, layers, options); the *networkName* can be any variable...

2 years ago | 0

Answered
Calling bowtie2 from matlab
Can you try running bowtie2 from matlab using the 'system' command. That is, [a,b] = system('bowtie2 -h') Also, there i...

2 years ago | 0

Answered
Scale a Legend with the underlying Axis
The observation that the size of the legend scales with the Font Size is true. Is there a reason you would prefer not to change...

2 years ago | 0

Answered
I want to merge the content of two tables with identical variables, but for a given key variable value the columns 1:N in table 1 are filled and columns N+1:end in the other.
Merging 2 tables on the basis of key variables and retaining only the common rows can be achieved using the 'innerjoin' function...

2 years ago | 0