# Benjamin Thompson

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**Content Feed**

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.

7 mesi fa | 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...

8 mesi fa | 0

Image analysis for speckle pattern

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

8 mesi fa | 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); ...

8 mesi fa | 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...

8 mesi fa | 0

| accettato

I need to know how to use the for command to calculate y=2/x

x = 1:10; y = 2 ./ x;

10 mesi fa | 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 ...

10 mesi fa | 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 ...

10 mesi fa | 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...

10 mesi fa | 1

| accettato

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...

10 mesi fa | 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...

10 mesi fa | 0

| accettato

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...

10 mesi fa | 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...

10 mesi fa | 0

| accettato

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 ...

11 mesi fa | 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 ...

11 mesi fa | 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 =...

11 mesi fa | 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...

11 mesi fa | 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...

11 mesi fa | 0

Hold the value of a signal

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

11 mesi fa | 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...

11 mesi fa | 0

| accettato

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 ...

12 mesi fa | 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...

12 mesi fa | 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, ...

12 mesi fa | 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?...

12 mesi fa | 0

GUI window to manually register two images?

You can try the registrationEstimator app included with the Image Processing Toolbox.

12 mesi fa | 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...

12 mesi fa | 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...

12 mesi fa | 0

| accettato

Load array into Simulink model from file without timestamps

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

12 mesi fa | 0

How can I convert double to const real_T of a sfunction?

If x is a constant you cannot change it. You would need to supply a more complete example, it is hard to tell what you are tryi...

12 mesi fa | 0

Simulink code generation for tcpclient

Looks like code generation support for tcpclient was added in R2019B. You may just have a configuration issue in your R2020A te...

12 mesi fa | 0