Pratyush Roy
Last seen: Today
MathWorks
81 total contributions since 2020I am an Application Support Engineer at MathWorks.
My responsibility is to provide the best support for an application like ML,Image Processing, Signal Processing.
Disclaimer: Any articles/idea/opinions here are my own and in no way reflect that of MathWorks.
Pratyush Roy's Badges
20 of your answers have been accepted
Awarded to Pratyush Roy on 15 Feb 2021
Answer 3 questions that were unanswered for more than 30 days
Awarded to Pratyush Roy on 03 Feb 2021
Contribute at least one answer each month for 6 consecutive months
Awarded to Pratyush Roy on 02 Feb 2021
Provide your first answer ever to someone else's question
Awarded to Pratyush Roy on 31 Aug 2020
Answered
3D Cross Correlation
Hi Wayne, Since cross-correlation between two arrays can be assumed to be convolution between the first array and the flipped v...
3D Cross Correlation
Hi Wayne, Since cross-correlation between two arrays can be assumed to be convolution between the first array and the flipped v...
13 days ago | 0
Answered
Exporting the 'statistical data' from Wavelet Toolbox
Hi, The feature for exporting statistics is currently not supported. As a workaround, the statistical functions can be applie...
Exporting the 'statistical data' from Wavelet Toolbox
Hi, The feature for exporting statistics is currently not supported. As a workaround, the statistical functions can be applie...
15 days ago | 0
Answered
Does varm use the current or lagged X
Hi Martijn, For an autoregressive model, the current output is dependent on past outputs and the present input. For the given e...
Does varm use the current or lagged X
Hi Martijn, For an autoregressive model, the current output is dependent on past outputs and the present input. For the given e...
15 days ago | 0
Answered
How to use GA (Genetic Algorithm) without explicit objective function and with data-set?
Hi, Genetic algorithm will not work without an optimization function. To understand how GA works, refer to this link. Hope thi...
How to use GA (Genetic Algorithm) without explicit objective function and with data-set?
Hi, Genetic algorithm will not work without an optimization function. To understand how GA works, refer to this link. Hope thi...
15 days ago | 0
Answered
Understanding accuracyValidation Output of Classifier
Hi Josh, The output acc is obtained by running the function predictFcn on the tree model. [CoarseTreeY,acc] = trainedCoarseT...
Understanding accuracyValidation Output of Classifier
Hi Josh, The output acc is obtained by running the function predictFcn on the tree model. [CoarseTreeY,acc] = trainedCoarseT...
15 days ago | 0
Answered
fast wavelet Transformation by using lowpass and highpass
Hi Jana, The highpass and lowpass functions can be used to perform one dimensional filtering. Let us consider the following s...
fast wavelet Transformation by using lowpass and highpass
Hi Jana, The highpass and lowpass functions can be used to perform one dimensional filtering. Let us consider the following s...
15 days ago | 0
Answered
Matlab OnRamp hangs on project tasks
Hi Laura, The link here might be helpful. Hope this helps!
Matlab OnRamp hangs on project tasks
Hi Laura, The link here might be helpful. Hope this helps!
16 days ago | 0
Answered
How to plot for physical bodys and streamlines?
Hi David, As rightly pointed out, the plot only displays a point since u and v values are not arrays but single points. To obt...
How to plot for physical bodys and streamlines?
Hi David, As rightly pointed out, the plot only displays a point since u and v values are not arrays but single points. To obt...
16 days ago | 0
Answered
How to get average power from simulink scope
Hi Yousef, Firstly the data can be exported to workspace as an array of shape (N,2). Here N represents the number of time insta...
How to get average power from simulink scope
Hi Yousef, Firstly the data can be exported to workspace as an array of shape (N,2). Here N represents the number of time insta...
17 days ago | 0
Answered
Customizing fitness function of genetic algorithm
Hi, The link here might be helpful! Hope this helps!
Customizing fitness function of genetic algorithm
Hi, The link here might be helpful! Hope this helps!
17 days ago | 0
| accepted
Answered
Why the ‘CategoricalPredictors’ properties are always empty after running fitrensemble()?
Hi Haris, You might consider the following workarounds for your problem: Answer to Question 1: The "CutPredictorIndex" index p...
Why the ‘CategoricalPredictors’ properties are always empty after running fitrensemble()?
Hi Haris, You might consider the following workarounds for your problem: Answer to Question 1: The "CutPredictorIndex" index p...
17 days ago | 0
Answered
How to Create NcNr*NcNt Block Circulant matrix
Hi Ayaz, The link here might be helpful. Hope this helps! Regards, Pratyush
How to Create NcNr*NcNt Block Circulant matrix
Hi Ayaz, The link here might be helpful. Hope this helps! Regards, Pratyush
22 days ago | 1
Answered
Applying an integer to a specific cell of a matrix
Hi Noah, The following code might be helpful : x = 0:0.1:3; y = -2:0.13:2; Load = 10;%Integer that we want the elements to r...
Applying an integer to a specific cell of a matrix
Hi Noah, The following code might be helpful : x = 0:0.1:3; y = -2:0.13:2; Load = 10;%Integer that we want the elements to r...
22 days ago | 0
Answered
How to forecast time series data using Kalman filtering technique on matlab?
Hi Ashok, The link here mght be helpful. You can also go through the documentation for Kalman Filter. Link is given below: ...
How to forecast time series data using Kalman filtering technique on matlab?
Hi Ashok, The link here mght be helpful. You can also go through the documentation for Kalman Filter. Link is given below: ...
24 days ago | 0
Answered
matchFeatures for multiple images
Hi Maria, The matchFeatures currently supports matching features between two images at a time. As a workaround, you can refer ...
matchFeatures for multiple images
Hi Maria, The matchFeatures currently supports matching features between two images at a time. As a workaround, you can refer ...
24 days ago | 0
Answered
poctave function is providing an unexpected center frequency value and resulting amplitude
Hi Matthew, I have brought this issue to the notice of our developers. They will investigate the matter further. Regards, Pra...
poctave function is providing an unexpected center frequency value and resulting amplitude
Hi Matthew, I have brought this issue to the notice of our developers. They will investigate the matter further. Regards, Pra...
24 days ago | 0
Answered
How can I obtain the coordinates(x, y, z) from a 3D isosurface plot?
Hi, The following link might be helpful: https://www.mathworks.com/matlabcentral/answers/249747-how-can-i-extract-xyz-data-fro...
How can I obtain the coordinates(x, y, z) from a 3D isosurface plot?
Hi, The following link might be helpful: https://www.mathworks.com/matlabcentral/answers/249747-how-can-i-extract-xyz-data-fro...
27 days ago | 0
Answered
SVM KernelFunction and KernelScale. What is the difference?
Hi Dylan, The KernelScale is a scaling parameter which is used to scale the data before evaluation of the appropriate Gram matr...
SVM KernelFunction and KernelScale. What is the difference?
Hi Dylan, The KernelScale is a scaling parameter which is used to scale the data before evaluation of the appropriate Gram matr...
27 days ago | 0
Answered
Integral of Power Spectral Density
Hi, The avgpower method available with the dspdata object in the Signal Processing Toolbox calculates the integral of the power...
Integral of Power Spectral Density
Hi, The avgpower method available with the dspdata object in the Signal Processing Toolbox calculates the integral of the power...
27 days ago | 0
Answered
Export TIF contourf with specific parameters
Hi, The following link might be helpful: https://www.mathworks.com/help/matlab/creating_plots/save-figure-at-specific-size-and...
Export TIF contourf with specific parameters
Hi, The following link might be helpful: https://www.mathworks.com/help/matlab/creating_plots/save-figure-at-specific-size-and...
27 days ago | 0
| accepted
Answered
poctave() returns incorrect fractional-octave-band results
Hi Witold, I have heard that this issue is known and the concerned parties may be investigating further. Regards, Pratyush....
poctave() returns incorrect fractional-octave-band results
Hi Witold, I have heard that this issue is known and the concerned parties may be investigating further. Regards, Pratyush....
28 days ago | 1
Answered
Denoising a signal with FFT
Hi, The array f stores the audio data obtained as a numeric array in MATLAB. This is not the same as an array containing the fr...
Denoising a signal with FFT
Hi, The array f stores the audio data obtained as a numeric array in MATLAB. This is not the same as an array containing the fr...
29 days ago | 0
Answered
'nlinfit' vs 'fitnlm' 'ErrorModelInfo'
Hi, There is currently no support for the ErrorModelInfo feature in fitnlm function. I have brought this issue to the concerned...
'nlinfit' vs 'fitnlm' 'ErrorModelInfo'
Hi, There is currently no support for the ErrorModelInfo feature in fitnlm function. I have brought this issue to the concerned...
30 days ago | 0
| accepted
Answered
How do you Save Trained Models from the MATLAB Classification Learner App?
Hi, One can refer to the following link for help: https://www.mathworks.com/help/stats/export-classification-model-for-use-wit...
How do you Save Trained Models from the MATLAB Classification Learner App?
Hi, One can refer to the following link for help: https://www.mathworks.com/help/stats/export-classification-model-for-use-wit...
30 days ago | 0
Answered
Help with spectral analysis of a time series
Hi, The following link might be helpful: https://www.mathworks.com/help/signal/ug/power-spectral-density-estimates-using-fft....
Help with spectral analysis of a time series
Hi, The following link might be helpful: https://www.mathworks.com/help/signal/ug/power-spectral-density-estimates-using-fft....
1 month ago | 0
Answered
Visualize rectangles chosen by randomCropWindow2d
Hi, The rectangle object comes with 2 properties, namely, XLimits and YLimits. XLimits captures the lowest and highest value of...
Visualize rectangles chosen by randomCropWindow2d
Hi, The rectangle object comes with 2 properties, namely, XLimits and YLimits. XLimits captures the lowest and highest value of...
1 month ago | 1
| accepted
Answered
txsite with 'CoordinateSystem' set to 'cartesian'.
Hi Varsha, The RF Propagation interface does not offer visualization support for showing Cartesian sites, their coverage, or ...
txsite with 'CoordinateSystem' set to 'cartesian'.
Hi Varsha, The RF Propagation interface does not offer visualization support for showing Cartesian sites, their coverage, or ...
2 months ago | 0
Answered
Scaled MAD in isoutlier
Hi, The c value here is approximately equal to 1.4826 and it is commonly used in outlier detection. It is even mentioned in the...
Scaled MAD in isoutlier
Hi, The c value here is approximately equal to 1.4826 and it is commonly used in outlier detection. It is even mentioned in the...
2 months ago | 0
| accepted
Answered
xcov sample covariance / dividing by N?
Hi, xcov in MATLAB computes raw covariances with no normalization. Hence after obtaining the results, one can divide by T to ob...
xcov sample covariance / dividing by N?
Hi, xcov in MATLAB computes raw covariances with no normalization. Hence after obtaining the results, one can divide by T to ob...
2 months ago | 0
Answered
Temperature control valve (G)
Hi, The behaviour from the model is expected. The temperature control valve, the constant volume chamber and the gate valve are...
Temperature control valve (G)
Hi, The behaviour from the model is expected. The temperature control valve, the constant volume chamber and the gate valve are...
2 months ago | 0
Select a Web Site
Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .
Select web siteYou can also select a web site from the following list:
Americas
- América Latina (Español)
- Canada (English)
- United States (English)
Europe
- Belgium (English)
- Denmark (English)
- Deutschland (Deutsch)
- España (Español)
- Finland (English)
- France (Français)
- Ireland (English)
- Italia (Italiano)
- Luxembourg (English)
- Netherlands (English)
- Norway (English)
- Österreich (Deutsch)
- Portugal (English)
- Sweden (English)
- Switzerland
- United Kingdom (English)