Answered
Soften hard constraints in MPC formulated as a QP-problem
You could try using 'fmincon' instead of 'quadprog', which would allow you to incorporate non-linear constraints on your state v...

8 years ago | 0

Answered
how can i plot multiple circles in a plot
After you finished plotting, use command axis equal to make aspect ratios of vertical and horizontal axes equal to one ...

8 years ago | 1

Answered
Fill area with random circles having different diameters
Here is a demo that uses rejection sampling and Delaunay triangulation <</matlabcentral/answers/uploaded_files/121175/circle_...

8 years ago | 1

Answered
Plotting discretized field in 2D
Here is an example: x_lim=[0 20]; x=linspace(x_lim(1),x_lim(2),11); [X,Y]=meshgrid(x); F=randn(size(X)).*X-ran...

8 years ago | 1

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Answered
How to solve transcendental equations in matlab
This is a complex-valued function. Just from visual inspection, it is apparent that the real part of this function has infinitel...

8 years ago | 0

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Answered
legend children empty, but need to set transparency
I had the same problem. I couldn't figure out a way to resolve it in Matlab, so instead I exported the graph as it was and then ...

8 years ago | 0

Answered
Integration of discrete data which have a non-linear relationship
Numerical integration based on Simpson's rule provides greater accuracy than integration using trapezoidal rule. Here is an impl...

8 years ago | 0

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Answered
Contour plot with 3 variables
% Grid y=70:160; x=0:60; z=10:80; [X,Y,Z]=meshgrid(x,y,z); % Evaluate function at grid points F=-1.69*X ...

8 years ago | 0

Answered
Complex numbers input in neural networks
You can represent a complex number, a+i*b, as a 2-vector [a b], so use that format instead. Suppose that F is an array of comple...

8 years ago | 1

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Answered
How can I place spheres along a circle/ring ?
See example below. All relevant functions used to generate this example can be found <https://drive.google.com/open?id=11Rc5WKrq...

8 years ago | 1

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Answered
Is it possible to plot Surfaces at specified coordinates?
If in addition to the vertices sampled from the surfaces you also have the connectivity information among the vertices, you can ...

8 years ago | 0

Answered
How to plot a function on a cylinder surface
Here is an example: % Right cylinder parameters z_min=0; % lower cut-off point z_max=4; % upper cut-off point ...

8 years ago | 2

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Answered
Is it posible in Matlab to model surface using spherical harmonics (SH) basing on 3d data? If yes, how can I do it.
If the surface in question is closed (i.e., no boundaries) and is genus-0 (i.e., ho holes or handles), then it is indeed possibl...

8 years ago | 0

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Answered
solving system of equations using singular value decomposition and fsolve
This is an overdetermined system (i.e., number of equations > number of variables). You can obtain least squares solution as X=(...

8 years ago | 1

Answered
How do I display 55x305x4 .mat file as an image in Matlab and save it ?
% Data array A=Position3DGrid; % Convert to uint8 I_min=min(A(:)); I_max=max(A(:)); A=uint8(255*(A-I_min)/(...

8 years ago | 0

Answered
From .stl to mathematical function. Is it possible?
If the object is has a relatively simple geometry and you want to get a compact description of its shape, one of the following r...

8 years ago | 1

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Answered
How can I accurately plot the centroid of black dots in MATLAB?
% Get the image im=imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/120388/MATLAB_QUESTION.PNG'); ...

8 years ago | 0

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Answered
Finding the part of a larger matrix that is most similar to a smaller matrix
Here is another example, in case you dont have an Image Processing Toolbox: % Random N-by-N matrix N=1E3; % ma...

8 years ago | 0

Answered
open an image in another image
Here is an example: im1=imread('peppers.png'); im2=imread('football.jpg'); im3=im1; im3(1:size(im2,1),1:si...

8 years ago | 0

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Answered
How to hightlight the mask in a image
Here you go: im=imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/119871/test1.png'); % grayscale ...

8 years ago | 0

Answered
Converting a stack of .bmp images into an .stl file
(1) Segment the object of interest in your 3D image, (2) Reconstruct boundary of the segmented object using 'isosurface' func...

8 years ago | 0

Answered
could anyone tell me how to save the values while the code is getting executed
save('FileName.m','name_of_variable_you_want_to_save')

8 years ago | 0

Answered
How i can convert cell (each element in cell with different length) to array?
Is this kind of what you are looking for? ex = {[1,2,4,5,7,11,12],[1,3,4,5,7,11,12],[1,2,4,6,5,7,11,12],[1,3,4,6,5,7,11,12]...

8 years ago | 0

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Answered
how to find maximum value in a matrix?
Demo of local search based on 4-connected neighbourhood: <</matlabcentral/answers/uploaded_files/119785/conn_4.jpg>> Demo ...

8 years ago | 1

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Answered
How to divide the brain segmented slices in left and right compartments (halves)?
The simplest way to approach your problem is to (1) Aggregate all (segmented) slices from a given 3D image to form a volume ...

8 years ago | 0

Answered
3D array permutation
Suppose you have G, which is a Y-by-X-by-Z 3D array, then i-th xy slice: G_yx=G(:,:,i); % Y-by-X array i-th xz slice...

8 years ago | 0

Answered
done , finish the task
You have to apply watershed algorithm to the original (grayscale) image, not the binary one. Can you post the code you are using...

8 years ago | 1

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Answered
How to find and draw boundary on some parts of an object in image?
Is this what you are looking for? im=imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/119409/Imag...

8 years ago | 0

Answered
Detecting centroid and orientation of capsules
If your capsules have parametric a representation (e.g., ellipsoid), you can use Hough transform (HG). Description of a HG varia...

8 years ago | 1

Question

Setting 'FaceAlpha'<1 for a patch object causes x- and y- axes of the plot to dissapear. Why and how can this be corrected?
Hello everyone, have any of you ever plotted a 2D patch object and noticed that upon altering its 'FaceAlpha' value below 1, ...

12 years ago | 1 answer | 0

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