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Jon


Last seen: 3 days ago
215 total contributions since 2013

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Answered
I don't know why I am not getting an arc when I change the dimension
I'm not sure from your code exactly what the parameters of your arc should be but this is probably closer to what you want. You ...

19 days ago | 0

Answered
How can I add variable amount of padding to each column in my matrix?
Try Apad = tril(A,-1)

20 days ago | 0

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Answered
How to solve equation with ten unknowns with Fourier Analysis
If you have the optimization toolbox you can use fsolve

20 days ago | 0

Answered
How to connect the plot point in matlab
First, you should avoid name your variable length, (which I think you mispelled in your example above as lenght) as length is a ...

21 days ago | 0

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Answered
Create array with average values
Use reshape. Say data is a 480 element vector X = reshape(data,12,40) Then if you want the average over all the data you can j...

21 days ago | 0

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Answered
Need Help Error using vertcat Dimensions of arrays being concatenated are not consistent. Error in myModel (line 20) dy = [lambda+theta1*Va+theta2*Vb-(beta*Ih+ mu+ alpha1+alpha2)*S;
The line of code you provide does not provide enough information to provide specific guidance. First you are missing a right ha...

24 days ago | 1

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Answered
How to read video and save each video to CSV file
Hi Kong clear all close all %// read the video: list = dir('*.avi') % loop through the filenames in the list for k = 1:len...

24 days ago | 0

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Answered
Trying to move images to different folder based on CNN classification, and failing
I would suggest checking the return status and error messages from movefile by assigning some left hand arguments to the movefil...

24 days ago | 0

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Answered
Computing all values for Width and Height
Here are some hints: So think about an equation that expresses the Area A in terms of H and W. Now you know A so if you specify...

25 days ago | 1

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Why isn't IF statement stopping Wile loop
You never break out of the inner loop where you alternate between players, so the condition doesn't get checked Try putting in ...

25 days ago | 0

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How to read several files and save CSV files in folder
You can use list = dir('*.avi') to get a list of the .avi files in your local director. Check out the documentation on the dir...

25 days ago | 0

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Answered
transform x,y coordinate to angle
I would think that you could use atan2 or atan2d (if you want result in degrees) for this. For example x1 = [2;1] % first poin...

25 days ago | 0

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Answered
point slope form on matlab? how should it be inputted?
I don't think there is anything wrong with you formula, I'm guessing you didn't define your x1,y1, m, and x properly. Try someth...

27 days ago | 0

Answered
issue with polyval and polyfit measuring time
One problem may be that you think that log(x) gives log to the base 10 of x but it is the natural log. So use instead xlog = l...

27 days ago | 2

Answered
How to calculate an average of a weather variable for a month during daylight hours only?
Here's an example of one way to do it filename = 'sgpceil10mC1.b1.20190101.000000.custom.csv' % read data into a table T ...

27 days ago | 0

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how to generate a random vector with fixed sum and bounded elements
Hi John, In case I have a chance to work on this some more, and for future reference, do you have any advice on quantitative tes...

27 days ago | 0

Answered
permutation matrix for process simulation
You should be able to loop using perms and nchoosek to do what you need. Something like this: % generate filtration test matr...

1 month ago | 0

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Answered
Is it possible to calculate the average Manhattan distance between a set of 2D points with one function?
I think this does what you want. You could probably make it more efficient recognizing the symmetry of the distance matrix, but ...

1 month ago | 0

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Answered
Splitting a vector into separate vectors using thresholds
While I was working on this I see you already got an answer from Stephen. My approach is similar although not as vectorized. A...

1 month ago | 0

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add time shift to signal vector
If you want to shift your data by an integer number of samples you can do something like this (here I'm just shifting y2, and pl...

1 month ago | 0

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Find rows of a matrix corresponds to accumarray results
I was having a little difficulty understanding the description of your problem but I think this accomplishes what you are trying...

1 month ago | 0

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Can Matlab generate this plot?
Something like this example should get you close: % make a matrix of data just to demonstrate, you would use your own data here...

1 month ago | 1

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Plot velocity profile of microfluid flow
Your use of the if elseif to determine what the appropriate function to evaluate is good, but you have a conceptual error on wha...

1 month ago | 1

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Answered
Write a function called valid_date that takes three positive integer scalar inputs year, month, day. If these three represent a valid date, return a logical true, otherwise false. The name of the output argument is valid.
I verified that your program correctly returns that valid_date(2017,9,31) is false. It looks like you are using some kind of te...

2 months ago | 1

Answered
How do you transfer this signal into linear form?
I see this is a follow up to your previous question which was answered in https://www.mathworks.com/matlabcentral/answers/506414...

2 months ago | 0

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Answered
User defined function "not enough inputs"
The error message means that when you called the function, either on the command line, or in another script, you did not provide...

2 months ago | 0

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Answered
How to solve a simple Matrix equation?
It looks like you want to find all of the vectors satisfying Ax = 0 for some singular matrix , A. If so, you can do this using ...

2 months ago | 2

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Answered
Picking the (n) th occurrence of a number in a vector or the (n)th row in a matrix.
% make a random vector of data just for example purposes x = rand(25,1); % define n for your nth element selection n = 3 % fo...

2 months ago | 0

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Answered
How do you separate imported data into time and amplitude?
If by detrend you mean that you want to remove the part of the signal that is growing linearly with time then the expression you...

2 months ago | 0

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Answered
Summing/taking weighted average within a range for a table
Let's say you have a table called T, that has a column called x. To find, for example, the sum row 10 through 18 of variable x ...

2 months ago | 0

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