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# Benjamin Thompson

Last seen: 9 days ago Active since 2015

Programming Languages:
C++, C, MATLAB
Spoken Languages:
English

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fft2 results don't match the analytical Fourier transform results
Your problem is 201 by 201 samples in size? Making the size a power of 2. So use 256.

15 days ago | 0

Real Time Low Pass Filtering
All digital filters working in real time must have some delay, this is a law of filtering in general. The amount of delay depen...

2 months ago | 0

Image analysis for speckle pattern
It is possible, try looking over this example: https://www.mathworks.com/help/images/correcting-nonuniform-illumination.html ...

2 months ago | 0

How to break data in to groups using while loop?
Even better, use the vectorization features in Matlab to count NaNs in each row all at once. nanCounts = sum(isnan(matrix),1); ...

2 months ago | 0

Replacing specific block with subsystems
Here is one way. I think you would just use a constant block rather than From Workspace because From Workspace is looking to us...

2 months ago | 0

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I need to know how to use the for command to calculate y=2/x
x = 1:10; y = 2 ./ x;

4 months ago | 0

How do I re-use values calculated in a while loop?
Theta1 and Theta2 have not been defined and given a value at the first reference. You should assign an initial value to Theta1 ...

4 months ago | 0

How do i find the RGB values of color image in range 1 to 255
If the image is stored in MATLAB as a three dimensional array, which is the usual, then the red/green/blue channel is the third ...

4 months ago | 0

How to create these shapes in Matlab
Where is the m-file referenced in the problem statement? That would probably help on some of the coding structure questions. Y...

4 months ago | 1

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Measurement of properties from Tiff image
If you are using the Image Processing Toolbox then you are probably trying to use the regionprops function with the "Area" prope...

4 months ago | 0

Not able to use the if condition as desired in simulink
You need to use the "if action" subsystem along with the "if". See the example in the documentation: https://www.mathworks.com...

4 months ago | 0

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How to copy 30K images from folder to another according to the names in train and test text listes
Use copyfile to copy a file to a new location. You could probably use arrayfun to more quickly add the full file path to the fi...

4 months ago | 0

Finding average data from a large data matrix
An index vector over the available columns would work well here. Cannot be sure without a complete example of the data. Then p...

4 months ago | 0

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Coalesce data from 1000 monte Carlo simulations with different data file lengths?
With the data import tool you can generate a function like this. It needs some editing to handle some of the odd formatting of ...

5 months ago | 0

Avoid a "loop for" to add multiple "datetime" elements to a cell array
If you can make is an N by 1 cell array and do the assignment using parenthesis indexing and num2cell, then convert that to the ...

5 months ago | 0

Create Integral, Differential, timer and counter blocks from basic blocks in simulink
You can use a Memory block, subtraction block, and gain block to approximate a differentiator, implementing the equation dx/dt =...

5 months ago | 0

How to make the flow diagram with if or any hint in Simulink?
A Stateflow chart is usually the best way to model a state diagram in Simulink. Try following the Stateflow Onramp training too...

5 months ago | 0

How to get the equation of irradiance varying in time for a PV model under partial shading conditions?
Simulink has a 2D lookup table block with various options for interpolation, extrapolation, and fitting. With the two inputs be...

5 months ago | 0

Hold the value of a signal
You can use the signal builder block to define any type of piecewise continuous signal you want.

5 months ago | 0

How to pass an input value to a Simulink block from M-file?
Your M file can put the data into the base workspace as a variable with a known name. Then your Simulink model can use the From...

5 months ago | 0

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How to change the color of each pixel in a masked image?
See if this helps. There is probably a faster way to do it with color mapping functions in the Image Processing Toolbox but it ...

6 months ago | 0

I gave the initial condition correctly still the program not working.
circshift returns a vector of the same length as its input. So, j2, j5, j8, and j19 are vectors and not scalar values as the li...

6 months ago | 0

How can I merge two structs?
Due to the need to merge it might be easiest to use struct2table, table2timetable, make sure it is merged well as a time table, ...

6 months ago | 1

Displacements and velocity from acceleration integration (accelerometer data)
The Simulink Onramp training course is a good place to start: https://www.mathworks.com/learn/tutorials/simulink-onramp.html?...

6 months ago | 0

GUI window to manually register two images?
You can try the registrationEstimator app included with the Image Processing Toolbox.

6 months ago | 0

how to run a simulation at different times
You can use the Signal Builder block to configure how you want a signal to change over time. I assume you are simulating the mo...

6 months ago | 0

Browsing the subsystem inside model using mscript
You can use open_system to open a Simulink model to some subsystem inside the model. The second parameter to open_system should...

6 months ago | 0

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If you define your matrix as a Simulink.Parameter in a data dictionary and link to that data dictionary from your model, that wo...

6 months ago | 0