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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...

6 years 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...

6 years ago | 0

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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 ...

6 years ago | 0

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How to assign an equation built by string to parameter c in nonlinear inequality constraint function for fmincon?
I don't think the approach you are following is worth pursuing further. Please see https://www.mathworks.com/help/optim/ug/pass...

6 years ago | 0

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how to generate a random vector with fixed sum and bounded elements
Maybe I am not understanding something, but it seems like your problem is overconstrained. You can easily make a length n vecto...

6 years ago | 1

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Programming and Coding for Beginners
I would strongly recommend first completing the MATLAB On Ramp. This will give you a quick general immersion in using MATLAB. La...

6 years ago | 0

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Matlab "Index in position 1 is invalid. Array indices must be positive integers or logical values."
The error is telling you that MATLAB thinks that the variable that you call maximum is a vector, and that you want to have eleme...

6 years ago | 1

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Answered
Faster/Simpler way to update my data in a table
Here's an approach that I think does what you want. You would have to benchmark the run time, but the approach is quite vectori...

6 years ago | 1

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Answered
Maximum size squares sub-matrixe with all zeros (having the same diagonal of the mother matrix )
I think this may be do what you want, or if not is close enough that you can modify it from here. The function emptyBoxes ret...

6 years ago | 1

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Answered
Kinetic equation, R=R∞{1-exp(-Kt)}
It sounds like you may not be too familiar with using MATLAB at all. If you need to get going quickly at using MATLAB I would h...

6 years ago | 0

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How to find settling time?
Here's a rough approach you might try. This code will not do the very last epoch, you could further modify to handle this spec...

6 years ago | 0

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How to handle timer
You probably have some error in the code, PlotImage, that the timer is calling. Debugging problems in timer functions is a litt...

6 years ago | 0

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Not enough input arguments
The 'Not enough input arguments' error message means that when you call the function foc_cia you are not providing the correct n...

6 years ago | 0

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How can I seperate these number from a cell and put it into a matrix.
You will not be able to put your data from the cell array you show to a matrix because you have both numeric and non-numeric dat...

6 years ago | 0

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Error, array indices must be positive integers or logical values
In your code Df is a 2 by 200 matrix not a function. It therefore does not make sense in the last line of your code to have the ...

6 years ago | 0

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Answered
Negative Eigenvalues found in 12x12 Matrix
I would trust the result of the eig function. If you do not think your matrix, cor, should have negative eigenvalues, then you ...

6 years ago | 0

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How to solve this error "Not enough input arguments."
Your function requires 4 input arguments. You must have called it with less than 4 input arguments. Please check your code where...

6 years ago | 0

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Answered
I cant solve linear programming
It is of course possible to have a linear programming problem that is unbounded. This happens if there are no constraints that p...

6 years ago | 0

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How to write a for loop that creates a vector of [1:1000, 1001:2000,....,n]
Just to make Geoff's suggestion more concrete, suppose you had a length 100000 vector of data points. You could put this into a ...

6 years ago | 0

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the meaning of basic matlab words
Are you familiar at all with "Object Oriented Programming" this is a general approach to software development used in many compu...

6 years ago | 0

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How to only plot the better result from a loop of 48 iterations in a convergence plot?
You could do something like this, assuming that your output is in vector y and iteration number is in vector iterCount plot(ite...

6 years ago | 1

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How to find the intersection point by plotting the red line like below?
Assuming you have the water level in a vector, lets call it h, along with the values of pExceed in another vector, you can int...

6 years ago | 1

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How can I achieve Matrix-Vector element-wise operations in Simulink Matlab Function Block?
I'm not sure why the MATLAB Function block can not handle the implicit scalar expansion, but I just tried using an Interpreted M...

6 years ago | 0

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For LOOP for splitting an ECG signal into different CHUNKS
It's not really clear to me from your description what you are trying to do. From what I can infer from your description you ha...

6 years ago | 1

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How to fix the time values of repeating sequence to get triangular wave?
I'm sorry I also have no experience with Simulink for Power Electronics so I can not help you with any issues that are specific ...

6 years ago | 0

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How to fix the time values of repeating sequence to get triangular wave?
If you want to make a triangular wave of amplitude A with period T just use Time Values [0 T] Output Values [0 A] You don't h...

6 years ago | 0

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Controlling Dynamic Stability Using Torque Vectoring.
MATLAB Answers is a good place to come for help with problems that you are having once you get far enough to actually be working...

6 years ago | 0

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Run cmd command from MATLAB
The system command can definitely be used for this purpose. I suspect that your problem is with the string you are passing the c...

6 years ago | 0

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How to create a Toeplitz matrix?
You can use MATLAB toeplitz function for this. See the documentation by typing doc toeplitz on the command line. Since your to...

6 years ago | 1

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Answered
Unable to perform assignment because the left and right sides have a different number of elements.
In your expression, the left hand side is just a scalar (only has one element) but you are trying to assign a length 4 column ve...

6 years ago | 0

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