Answered
Find the intersection of a square pixel with a closed 2D curve
Doesn't consider below case (use intersect() if it matters to you): Only when nodes inside our outside (base on inpolygon()) ...

7 years ago | 1

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Anyone have any tips to improve my code for findpeaks() so that I get only the first big peaks for each graph like those in transducers 10,13 and 1 but only one of them per graph? I want the first arrival time. Thanks.
If you want first peak use locs(1) If you want max peaks use max() If you want a few maximum peaks use sort() Did i understan...

7 years ago | 0

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How to solve a system of two non-linear equations symbolically
Use matlabFunction() to make function handle from symboliv expression L0 = matlabFunction(L0); L1 = matlabFunction(L1); A = 0...

7 years ago | 0

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Solving for ball trajectory with quadratic drag
'What I've noticed is that positions x,y,z don't even appear in my equations, so they are not used inside the function dxdt.' I...

7 years ago | 1

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Answered
Helping to create animated wrapping line on a torus
Read about surf() and meshgrid() to plot torus Simple example for animation (actually it's just drawing new object in time) Re...

7 years ago | 0

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Aircraft wing fuel tank modelling
Another way: Calculate the volume of a tank at some control levels % schematic algorithm if V < V1 Y_fuel ...

7 years ago | 0

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How to calculate the distance, in pixels, between each centroid in a binary image.
pdist2 finds distances between every point (every possible combinations. Zeros in matrix means distance to points themselves) ...

7 years ago | 1

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How to find the boundary points in one direction
What if just find() indices where x > 0.95?

7 years ago | 1

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Answered
I know a certain y1 and I want to find the respective x1.
I'd use polyxpoly or intersections x = linspace(0,10,20); y = sin(x); y1 = 0.6; % find x at y=0.6 ...

7 years ago | 0

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ode23 , matrix equation , 2nd order DE
You can find roots for x'', y'' and dtheta'' every iteration solving matrix equation function du = func(t,u) u1 = u(1:3)';...

7 years ago | 0

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Answered
How to connect lines in a skeletonized image with arcs
Use bwmorph() to find branch points. I sorted them in counter clock-wise order: Find distance and center between neighbor poi...

7 years ago | 0

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Find the set of 3d data parrallel to the current 3d data
Choose some points (P1,P2,P3) from your data - vector of the first line (blue) - some temporary vector between P2 and P3 poi...

7 years ago | 0

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Answered
How do I select the pixels outside my region of interest?
m = size(I,1); % number of rows n = size(I,2); % number of columns R = 100; % radius region [X,Y] = meshgrid(...

7 years ago | 1

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Answered
How to avoid painting outside the figure using linewidth
Use axis([xmin xmax ymin ymax])

7 years ago | 0

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How to get selected faces in a plotted 3D geometry
Try to change

7 years ago | 0

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2DOF Harmonic Oscillator - Is this right? (How would I do this with ODE45?)
What about ode45? % x(1) == xs % x(2) == dxs % x(3) == xm % x(4) == dxm % fun = @(t,x) [ Vs; d2xs; Vm; d2xm ]; fun = @(t,x...

7 years ago | 0

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Solving system of non linear equations of oscillating mechanism on ODE45
There is something wrong in your (3) equation. I'd first express (4), (5) and (6) like: And substitude it into (3): ...

7 years ago | 0

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Calulate width of every boundary point to majorAxisLength
Just count pixels in vertical direction with sum() I = imread('image.png'); I1 = im2bw(I); % binary image h ...

7 years ago | 0

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Answered
How to simulate an ODE when one of the parameters is a function of time
Read how to Pass Extra Parameters in help ode23: sol = ode23(@(t,x)Eq(t,x,par),[0 Tfinal],x0); % solving the model Passing tra...

7 years ago | 0

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Numerical integral over the whole spherical volume of a crystallite
Suggestion: Use integral or trapz

7 years ago | 1

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Numerical integration with many parameters.
You forgot about element-wise operator delta=1-Mycp./100; Look also for VECTORIZE

7 years ago | 1

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Why doesn't this code rotate and transform the spiral?
Because you have to mulptiply each set of point separately ptsNew = zeros(size(pts)); for i = 1:1000 ptsNew(:,i) = mTrans...

7 years ago | 0

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how to calculate a ellipsoid arc and project it onto a plane?
I'd build a plane through 3 points (X,Y for plane surface and for ellipsoid surface must be the same) C = contour(X,Y,Zp-Zs,...

7 years ago | 0

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Generate a multiplicative cascade process
Probably should think about initial m, w, z m = 0.2; z = rand; w = rand; syms x y = -x-z-w+1; eq = x^2+y^2+z^2+w^2 -m; ...

7 years ago | 0

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Answered
Heat map visualizing touch pressure on smartphone in x-y space
I did my best, please like it

7 years ago | 1

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Answered
solving a system of ODE
Function looks okay except f/u1. Has to be (as instruction says): ydot = [(ps - p)/d + ppval(f,t))/u1 ... Read about ode45. Ma...

7 years ago | 0

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3D human body for temperature analysis
A lot of work has to be done clc,clear [x, y, z] = cylinder; surf(5*x,5*y,20*z*(1-0.5)) % main body hold on surf( z*7+2,x,...

7 years ago | 1

Answered
How can I plot elliptical pressure distribution
You mean surface or pcolor? [x,y] = meshgrid(-5:0.5:5); Pmax = (3*N)/(2*pi*a*b); pn = Pmax*sqrt(1-(x/a)^2-(y/b)^2); surf(x,y...

7 years ago | 1

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Answered
How can I change what information is displayed when clicking on figure elements?
Try to change

7 years ago | 0

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Answered
Distance difference from center
I did this xyz0 = (mean(xyz)+mean(abc))/2; % O point XYZ0 = repmat(xyz0,size(xyz,1),1); % duplicate...

7 years ago | 0

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