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interpret a simple matrix code
I recommend to use the free Matlab tutorials to learn the basics: https://www.mathworks.com/learn/tutorials/matlab-onramp.html ...

23 days ago | 0

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Answered
Calculate the volume of a body
x1 = [-0.5, 3.90]; y1 = [-0.5, 3.70]; x2 = [-3.90, 0.5]; y2 = [-3.70, 0.5]; axes('NextPlot', 'add'); line(x1([1,1,2,2,1])...

23 days ago | 1

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How to create price weighted index function?
Start with using Matlab methods instead of the loops: avg = AvgPrice2019; meanAavg = sum(avg); pweight = avg / meanAvg;...

23 days ago | 0

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Answered
Can someone help me understand why I cant get a graph with an alpha of 0.001
With alpha = 0.1 only the 3rd case of the if-branches occurs. Then dxdt is replied as [3 x 1] vector. With alpha = 0.001 the fi...

23 days ago | 1

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How do I verify if a structure array is a subset of another structure array
You have to write your own tool to test for your definition of a struct-subset. Maybe: % [UNTESTED CODE] function T = isStruct...

23 days ago | 0

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Answered
please help, how can i create the following matrix? 𝒂 = ( 𝒆 𝟏 𝒏 𝒏 𝒎 𝒆 𝟐 𝒏 𝒎 𝒎 𝒆 𝟑 ⋯ 𝒏 𝒏 𝒏 𝒏 𝒏 𝒏 ⋮ ⋱ ⋮ 𝒎 𝒎 𝒎 ⋯ 𝒆 𝒏 𝒏)
Use the functions triu, diag and tril . Another option is to start with zeros(m, n) and running 2 for loops. Then compare the i...

23 days ago | 0

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how to store the conditional loop data
Your cleaned code: ut = rand(15, 1); uy = [0.84; 0.384; 0.784]; U_y = repmat(uy, 5, 1); for n = 1:15 if ut(n) > U_y(n...

23 days ago | 0

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Sorting a BigInteger array
How dod you create the array? Please post a short example. I seems that you are talking about a Java class, not a Matlab array. ...

23 days ago | 0

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Matrix or vector operation faster?
The number of multiplications is the same in both versions, as far as I can see. So I'd expect both to need almost the same time...

23 days ago | 0

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Answered
Populate a 1000x1000 array with rows where a value is added every second, then third etc. column
You want an output of size 1000x1000: M = zeros(1000, 1000); You want a loop to go from 1 to 1000: for k = 1:1000 ... e...

24 days ago | 1

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Answered
How can I import "curl" API in MATLAB using webread function?
What about using curl instead? This is included in Linux, MacOS and Windows also: system(['curl "https://www.sapsailing.com/sai...

24 days ago | 1

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Answered
Finding allowed inputs to a function
Not in general. If a function uses the modern arguments block (since R2019b), this is possible. But many users are running older...

24 days ago | 0

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how to find sum different data for two different variables using loop in matlab
Maybe you want to do: "Multiply each element of vector a with all elements of vector b, devide by 100 and get the sum of all res...

24 days ago | 0

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Matrix is singular to working precision
Why do you assume, that something is wrong? The provided matrix is near to singular. In 1-D this would mean, that you try to div...

24 days ago | 0

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Solve the following simultaneous equations:
f1 = @(t,y) [-X/theta+(1+alpha)*y1(1-X)*Y^2+beta*y1(1-X)*Z^2; ... ... % ^ ^ * are ...

25 days ago | 0

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Answered
converting a matrix into a column vector using only while-end loop
This sounds like a homework question and you have shown, what you have tried so far. function A = func4(M) [m,n] = size(M); A...

25 days ago | 0

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Answered
Rename files after a certain string in the file itself appears
An explicit example would be useful: old name and new name. Maybe: files_csv = dir('*.csv'); for i = 1 : length(files_csv) ...

25 days ago | 0

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Answered
what's the code inside angle2dcm?
While I cannot find the code of angle2dcm , the equivalent function eul2rotm is useful for the explanation also. It produces the...

25 days ago | 0

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I am trying to make a new matrix for each iteration of a for loop
Q_bar = cell(1, length(theta)); for i = 1:length(theta) m = cosd(theta(i)); n = sind(theta(i)); T1 = [m^2, n^2, ...

25 days ago | 1

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While loop execution with multiple numeric and logical conditions
The code looks fine. Do you have a problem with it? It is a good programming practice to avoid repeated code. Maybe this is "cl...

25 days ago | 1

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Answered
Failure in initial objective function evaluation. FSOLVE cannot continue.
You provide a handle to a script. This cannot work, because fsolve expects a function handle. Most likely you want: fsolve(@fcn...

25 days ago | 0

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Error using quiver The size of X must match the size of U or the number of columns of U.
x = -10:10; % No need for meshgrid since Matlab R2016b y = (-10:10).'; % simply use a row and a column vector k = 1; q...

25 days ago | 1

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Answered
How does MATLAB REALLY pass arguments to functions?
See this blog about inplace operations: https://blogs.mathworks.com/loren/2007/03/22/in-place-operations-on-data/ And the docum...

25 days ago | 2

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Answered
How to register high resolution images of same modality?
If you image is stored in double format, it uses 10 GB of RAM. On a 64 GB machine this should work. So is installing more RAM an...

25 days ago | 1

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How to campare signals with different length?
It depends. You can compare two sine waves, if one has 80 and the other one 75 samples. But how do you define "similarity"? You...

25 days ago | 0

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How to I iterate a random selection among given elements without selecting the same element twice?
By the way, your code wouzld be much cleaner and shorter, if you use arrays instead of hiding indices in the field names: Define...

25 days ago | 1

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Answered
What are the ideal computer specs for parallel computing with large data sets?
If the RAM is exhausted, the SSD or HDD is used as virtual RAM. This slows down the processing massively. You would see this by ...

26 days ago | 2

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Error when saving figure with linux command line
In batch mode, Matlab does not support interactive GUI elements. How do you save the figure as PNG? See: https://www.mathworks....

26 days ago | 0

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Unable to perform assignment because the left and right sides have a different number of elements.
Schwerp_X = first_Moment_X./en_density; Schwerpunkte_X(i) = Schwerp_X; first_Moment_X is a vector, so is Schwerp_X,...

26 days ago | 0

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How do I vectorize my nested for loops for a convolution operation example?
Not a vectorization, but some tiny changes, which let the code tun 30% faster (at least in Matlab online - test this locally!): ...

26 days ago | 0

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