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darova


480 total contributions since 2019

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Answered
Removing points from meshgrid (mask)
Try this simple script [X,Y] = meshgrid(1:20); n = [1 -1]; n = n/norm(n); % normal of a line dist = -7; ...

ungefär 5 timmar ago | 0

Answered
How can I find the surface normal of a 8 by 3 matrix?
Use griddata to create a surface Use surfnorm to find normal vectors [nx,ny,nz] = surfnorm(x,y,z); surf(x,y,z) hold on quiv...

ungefär 5 timmar ago | 0

Answered
How do I increase the circle size and animate a stick figure?
Use for loop and pause t = linspace(0,2*pi); x = cos(t); y = sin(t); axis([-10 10 -10 10]) hold on for i = 1:10 h = p...

ungefär 14 timmar ago | 0

Answered
Finding specific data point x for given y
I need to find the CB and CS values at t=5 Use interp1 to find i need to find the t and CB values when CS = 0.001 Use fsolve ...

ungefär 14 timmar ago | 0

Answered
Surface between 3D lines
You are concatenating in a wrong way XX = [D1 D1 D1]; YY = [F1 F2 F3]; ZZ = [z1 z2 z3]; surf(XX,ZZ,YY,'EdgeColor','none')

ungefär 14 timmar ago | 0

Answered
two body problem using ode45
- equation of equilibrium Is this condition fullfield?

en dag ago | 0

Answered
Numerically Integrating the differential equation below?
Any guidance on it is much appreciated! Helpfull page: ODE45 I do not know what I can do if I no tf. Try tf = 5. This should ...

2 dagar ago | 0

Answered
Streamline plot not complete
Works ok for me N = 15; xx = linspace(min(x(:)),max(x(:)),10); yy = linspace(min(y(:)),max(y(:)),10); [startx,starty] = mes...

3 dagar ago | 0

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Answered
2D Matrix revolution
Use cylinder for each curve separately: z = linspace(-1,1,20); % axis r = sqrt(1-z.^2); ...

3 dagar ago | 0

Answered
How do I align the vertices and the adjacency graph of a Buckyball?
Here is a way ind = full(B); % convert to ordinary matrix [rr,cc] = find(ind); % find non-zero elements ix = ...

5 dagar ago | 0

Answered
Find the coordinates of a point chosen on a plot
Short example x = linspace(0,2,20)'; % generate some data y = sin(x); plot(x,y,'.-b') xy = ginput(1); ...

7 dagar ago | 1

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Answered
How do I create a sphere without sphere function that will inflate like a balloon utilizing the getframe function?
Use surf to create a 3D surface rr = linspace(0,0.5,20); tt = linspace(0,2*pi,40); [R,T] = meshgrid(rr,tt); [X,Y] = pol2cart...

9 dagar ago | 0

Answered
Differential Algebraic Equations with vectors
Try f = @(t,u) inv(Z)*(J+p*W*pi*Q)*[u(3) u(4)]' + inv(Z)*(V+p*W*pi*Q)*[u(1) u(2)]'; F = @(t,u) [u(3) u(4) ...

9 dagar ago | 1

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Answered
How to find the handle of all markers in plot (already made)?
To set up markerSize to every marker try: h = get(gca,'children'); for i = 1:length(h) if strcmp(get(h(i),'type'),'line')...

10 dagar ago | 0

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Answered
Ytick Spacing on Bode Plot Magnitude
If you are using subplot ax1 = subplot(211); plot(x1,y1) ax2 = sbuplot(212); plot(x1,y2); set(ax1,'YTick',[1 2 3]) set(a...

12 dagar ago | 0

Answered
How to plot a graph in simulated annealing code? How can we know the solution is near the true value?
How can I be confident that the solution is near the true value as the minimum value keeps changing when I run the code? Well, ...

12 dagar ago | 0

Answered
Using Runge Kutta function to solve Rossler equations
Write your f function as x'(t)=-x(t)-y(t) y'(t)=ax(t)+y(t) z'(t)=b+z(t)(x(t)-c) %where I fix parameters say c=5, b=3, a=0.2...

12 dagar ago | 1

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Answered
Complement of an Image using loop
Use this trick for i = 1:m % rows for j = 1: round(n/m*(m-i+1)) % columns I(i,j) = original; end ...

13 dagar ago | 0

Answered
Doubt in MATLAB program
Here is the problem Also you have y(1),y(2),y(3). It means that you have 3 initial condition values, also you should have 3 d...

13 dagar ago | 1

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Answered
How to find the center to contour angle in matlab
Use edge to detect contour find (x,y) coordinates (remember x - columns, y - rows) coordinates need to be sorted (hint: divide...

13 dagar ago | 0

Answered
Max change in z within a certain radius of a point
Use logical conditions ix = (x-x0).^2 + (y-y0).^2 < 20^2; z(ix) % all z values around (x0,y0) r=20

14 dagar ago | 0

Answered
find the first change and its position
Use diff and find

14 dagar ago | 0

Answered
exit from the cycle
Use break to exit loop 2) how to work with rows and columns The question is unclear. You can use 2 for loops for i = 1:size(A...

14 dagar ago | 1

Answered
Get the Volume of Intersection Between Two 3D Shapes?
Use equations to get intersection lines: Integral can be used to calculate the volume (1/8 of the volume) and

14 dagar ago | 0

Answered
Input formula to be used in a function
Use function handle function main f = @(x) 2*x + 1; % function handle func(f,2,3) function res = func(f,a...

14 dagar ago | 0

Answered
How can I color something in an image with a specific color?
Use this

14 dagar ago | 0

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Answered
Edge detection when the boundaries are clearly marked
Try this: A = imread('test.jpeg'); subplot(1,2,1) imshow(A) RGB = [140 224 226]; % color you want (cyan) % RGB = [...

14 dagar ago | 0

Answered
calling gradient multiple times
It's because of calculation first and last point. gradient does it this way: first_grad = (y2-y1)/dx; second_grad = 1/2*(y4-y3...

15 dagar ago | 0

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Answered
Find the partial minimums in a set of values
Use findpeaks(-data) Choose peaks that lie in 23 < x < 27 and 58 < x < 62

15 dagar ago | 0

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Answered
Alternatives to Delaunay triangulation
Volume can be found as summation volume of pyramids. Here is an idea: clc,clear load Coords.txt x = Coords(:,1); y = Coo...

15 dagar ago | 0

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