Answered
rmpath does not remove folders on path
No, as you have been warned "/Users/siggia/Dropbox @RU Dropbox/Eric Siggia/Desktop/claude/matlabCP1" is not on your Matlab path....

28 days ago | 0

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Answered
Discrepancy in sparse matrix math, when NaN's present
The response I seem to be getting from Tech Support is that this is expected behavior. NaNs are not guaranteed to propagate the ...

1 month ago | 0

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Answered
Numerical Integrators With Problem-Based Optimization
but quickly realized that the class of variables used in the problem-based approach will not work with ode45 (or any root-findin...

1 month ago | 1

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Question

Discrepancy in sparse matrix math, when NaN's present
I expect result1 and result2 below to be identical, but they aren't. The discrepancy must be a bug, right? I'm working in R2024b...

1 month ago | 1 answer | 0

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answer

Answered
Create a 2D image based on what a camera would see
You could just do a surface plot of the object, set the camera position parameters of the axes, and then use exportgraphics (whi...

1 month ago | 0

Answered
Assigning different data types to struct arrays using comma separated list assignment. Are there better options?
I like the performance of the code, however, I find it more difficult to read than for-loops Why not just use for-loops then, i...

1 month ago | 0

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Answered
I am getting the following error
There are many ways to generate that error. One of them is that you may be using 'end' as the name of a variable, e.g., end=1

1 month ago | 0

Answered
How to extract a specific frame from a video based on user input?
This example looks applicable to you: Read Video Frames Starting at Specific Time.

1 month ago | 0

Answered
Why do Nan values greatly increase the cost of sparse multiplication
I think you should report it as a bug. If you need a workaround, though, the following equivalent operation, which avoids implic...

1 month ago | 0

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Answered
How can I execute a function if it exist, otherwise use a custom function?
Have the used append (i.e., not prepend) your knnsearch to the path. If a native knnsearch exists above it in the path, it will ...

1 month ago | 0

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Answered
how to create a volume from the revolution of a variable area trapezoid
Here's a little bit more of a polished version of my original answer, which also generates a movie of the trapezoidal cross-sect...

1 month ago | 3

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how to create a volume from the revolution of a variable area trapezoid
Along the lines of what @Mathieu NOE commented, I think it does make more sense to start with an elliptic cylinder and clip off ...

2 months ago | 3

Answered
Efficiently assign data into a struct?
You can replace all occurences of '1:end' with ':' and condense your indexing operations. This, for example, T1.var4.y = zer...

2 months ago | 0

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How to multiply different size arrays and multiply each element by each element?
Download ndgridVecs from the File Exhange, https://www.mathworks.com/matlabcentral/fileexchange/74956-ndgridvecs?s_tid=srchtitl...

2 months ago | 0

Answered
Error using trainnet (line 46)
It appears that if your XTrain is in cell array form, you need to put your TTrain data in cell form as well: load('attachedData...

2 months ago | 1

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Answered
Indexing a 4-D array using a logical matrix
Assuming you are trying to extract the polygon interiors, you could do, [~,~,p,q]=size(map); Map=reshape(map,[],p*q); tes...

2 months ago | 0

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Answered
What is the difference between different ways to do least square
The train_100 system is underdetermined, so of course you aren't going to get a unique solution. For the 5k data, the only rea...

2 months ago | 1

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Answered
How to change the ratio of sectors for a circle with 8 equal sectors
One possibility: dTheta=360/8; %sector angle t=linspace(0,dTheta)'; sector=polyshape([0,0;cosd(t),sind(t)]); circle=array...

2 months ago | 0

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Answered
How to convert trajectory of the current vector to grayscale.
Maybe this is what you wanted? load("data.mat") Ia = data(:,1); Ib = data(:,2); Ic = data(:,3); %% Clarke (3 phase → αβ...

2 months ago | 1

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Answered
optimization optimplot capture frame
optimplot does not plot in a figure container of the type that you can get a handle to. Prior to R2025, you could probably have...

2 months ago | 0

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Answered
Preconditioning in fmincon
EDIT: You cannot pass a preconditioner on its own, nor would you want to if the true Hessian can be computed. However, using eit...

2 months ago | 0

Answered
How can I fit data to a piecewise function, where the breakpoint of the function is also a parameter to be optimised?
Why ? Both parabola can intersect below their respective maxima, and nonetheless the point of intersection can be the maximum y-...

2 months ago | 0

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How can I fit data to a piecewise function, where the breakpoint of the function is also a parameter to be optimised?
Once you've chosen the coefficients of the first parabola [a1,b1,c1], the breakpoint is determined from, d=-b1/(2*a1) Only the...

2 months ago | 0

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Answered
suprisingly complicated optimization problem
This is another suggested strategy: to find the minimum possible qmax, given L. This seems at the very least like an important f...

2 months ago | 1

Answered
suprisingly complicated optimization problem
The motivation of this problem is the creation of the so called, "homogenized" 1-D grid, where consecutive distances between ele...

2 months ago | 0

Answered
suprisingly complicated optimization problem
Here's another formulation, closer to your original one. It uses fmincon and is really fast (when the problem is feasible), but ...

2 months ago | 1

Answered
suprisingly complicated optimization problem
My thought is that you, (1) Do not include L in your list of unknowns. Solve a series of optimization problems for fixed L=1,2,...

2 months ago | 2

Answered
How to check whether a name is a locally accessible function?
One way, function tf = top_level_function(name) s=functions(str2func(name)); tf=strcmp( s.type , "scopedfunction") ...

2 months ago | 0

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Answered
how to find orthonormal vector with condition?
n=[0,null([y,z])']

2 months ago | 0

Answered
Error `Index exceeds the number of array elements` while loading .mat file
You have created a variable named 'load' in this line, load = 0; % 轴承的载荷（单位：马力）（可能是0、1、2、3马力） and later also in,...

2 months ago | 1