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how to export two mat.files into a single excel sheet?
Read all your files using load Write all the data using writematrix

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Plotting letter "D" on 3D space
3D letter D r = [1 1.5 1.5 1 1]; % radius of a circles t = [-20:10:200 -20]'*pi/180; % closed contour [T...

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How to restart a for loop when specific condition is met?
Place for loop inside while loop k = 0; while k < 5 for i = 1:10 if i > 5 k = k + 1; b...

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extracting sub matrix from a cell array
Try data1 = data{1}(:,3:8)

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how can I plot a matrix against two other ones? (need to a matrix 3d plotting )
Use surf [x,y,z] = peaks(30); h = surf(x,y,z); for i = 1:20 z = z + 0.5*rand(30); set(h,'zdata',z) pause(0.5) ...

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Finding the intersection points between two curves
I'd try fsolve for solving Read help carefully: fplot(f,[0 10])

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isosurface with wall thickness
What abouy simply to make thicker a lines? [x,y,z] = peaks(30); surf(x,y,z,'linewidth',3)

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how do i continuously calculate an output with an increasing input of angles ?
You need to make wi vector the same size as wj and wk wi = [-w_n+theta*0 0 0]; % i component of W

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How to get the curvature of a meshed surface?
Here are some ideas: Simple way: Precise way:

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Change the value of independent variables to solve the dependent variable equation
Use function handle x = 0:.1:10; f = @(a) sin(a*x); plot(x,f(2),'r') line(x,f(5))

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Detecting circles in noisy images with high intensity variations (must work for all cases)
Is the circle the only figure of closed form? A0 = imread('Sem Título.png'); A1 = im2bw(A0); A2 = imdilate(A1,ones(10)); ...

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Detecting black blob (mouse) in .tif frames
Here is the siple script that does the job A0 = imread('img1.png'); A1 = im2bw(A0,0.2); montage({A0 A1})

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Plot lines from FEM (PDE) stress vectors
% generata data n = 20; % number of points x = rand(20,1); y = rand(20,1); u = rand(20,1); v = rand...

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Can this loop containing different indices be vectorized using implicit expansion (or otherwise)?
Simply remove keywords for and end. Don't forget about element wise operator (dot)

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Plot a moving wheel in the 3D space
% create model t = linspace(0,2*pi,10); [x,y] = pol2cart(t,1); X = [y*0;y*0;y*0+2;y*0+2]; Y = [y*0;y;y;y*0]; Z = [x*0;x...

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How to Draw an ellipsoid between two 3d coordinates
Use rotate to rotate the ellipsoid

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FEM : plotting stress field in each T3 element
Here is an example: [x,y] = meshgrid(-2:0.2:2); % x,y range z = x.^2+y.^2-4; % z value h0 ...

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Specifying condition criteria for while loop iteration
Did you try to assume the sign of the function value? Derivative can be positive and negative regardless of the value Maybe s...

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How to get the volume and surface area of separated isosurfaces
Use bwlabel to separate each blob

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How to find opposing triangle pairs in triangulated objects?
Here is an idea or finding neigbour points; % some data x0 = rand(40,1); y0 = rand(40,1); s1 = max(max(x0)-min(x0),max(y...

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vector of line chart objects returned by plot - problem with modifying markers,...
Try this x = 0:10; y = sin(x); h(1) = plot(x,y,'r'); h(2) = line(x,y+.5); set(h(2),'marker','.')

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maps and isolines on the map of the continents
What about this? t = 0:0.02:2*pi; % angle r = 1 + 0.1*cos(10*t); % radius [x0,y0] = pol2cart(t,r); % calcu...

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Solve a complex differential equation over different intervals
Here are some notes: there is no need of creating special mesh. You have 3d order diff equation so you need 3 yinit yinit = [p...

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Transform a Numpy array of a mask
Assume A is your 3D matrix (1024x1024x3) A1 = A(:,:,1); % extract first matrix

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Extracting points from polyshape
See this link about curve interpolation: LINK Saving the data as a picture is a good idea too: try print x = 0:20; y = sin(x)...

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How to create membership functions matlab in triangular form?
Use sine wave x = 0:pi/2:20; y = sin(x); plot(x,y)

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Draw arc with specified angle difference
Wha about this representation? s = load('data.mat'); t = linspace(0,1,20)*pi/180; % angle array [X,Y,Z] = deal( ze...

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How to show two axis on a plot only where i want them
try this yticks h = plot(0:10,sin(0:10)); yy = 0:0.2:1; [x,y] = ndgrid([0 10],yy); line(x,y) yticks(yy)

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Volume of a solid of revolution for a cross section by points
Looks like simple ellipsoid. Try alphaShape n1 = 50; % circle points n2 = 10; % number of circles [x,...

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Generate distinct geometric shapes by using radius ?
Here is ax example t = linspace(0,2*pi,4); % triangle [x,y] = pol2cart(t,30); % cartesian coordinates % move tria...

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