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# darova

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540 total contributions since 2019

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how can i solve this error?
Oops?

1 day ago | 0

help with plotting needed!
Use plot clc,clear HQ10 = [1 1.5 1.7 1.6 1.8 2.1 2.2 2.5]; HQ100 = [1.9 2 2.2 2.5 2.7 2.9 3 3.1]; HQ1000 = rand(1,length(H...

1 day ago | 1

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surf creates two surfaces, one matches the data points but the other incorrectly connects opposite edges directly
Try x1 = linspace(min(x),max(x),5); y1 = linspace(min(y),max(y),5); [X,Y] = meshgrid(x1,y1); Please use special buttons

1 day ago | 0

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Symbolically differentiation a function w.r.t a function
Try this syms g(x) h(x) x f g(x,f) = sqrt(f^2 + x); h(x,f) = diff(g(x,f),f)

1 day ago | 1

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rotating this curve 20degrees
Use rotation matrix a = 15; R = [cosd(a) sind(a); -sind(a) cosd(a)]; v = R*[t(:) sdata(:)]'; plot(v(1,:),v(2,:))

3 days ago | 0

Creating a 2D temperature plot
Use griddata. It's the easiest way

4 days ago | 0

Find the orientation of the skeletonized image
You can write your own function: use imline to create a line draw a line aligned with horizontal/vertical one calculate the ...

4 days ago | 0

How to calculate a curvature of 3D isosurface?
You can use surfnorm to extract normal vectors from surface Choose close enough vectors to calculate curvature Angle between ...

5 days ago | 0

i did some changes in red,green,blue channel of the image .Now when is am using cat function it is giving me full white image.This is not the output i want
You have white image because of format. Try imshow(uint8(new_img)); your code can be shorter (no for loop needed) image=imrea...

5 days ago | 1

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How to locate the vortex eyes in a vector field without using the data cursor and find the circulation around the eye.
You want to find velocities inbetween [0,-30.46]. So just select appropriate indices: idx = -30.46 < vy & vy <= 0; vy1 = vy; ...

5 days ago | 0

Solving system of eqution using vectors
You should create a system of equations. You need 4 points and 4 equations syms x0 y0 z0 r0 eq1 = (x0-x(1))^2 + (y0-y(1))^2 + ...

6 days ago | 0

Solve a large composite set of equations numerically
I think there is no exact solution for k. Try something like this: % 1 [X,Y,Z] = ndgrid( linspace(-1e5,1e5,20) ); f = fx*X + ...

6 days ago | 0

How can I join points with line
Try to reshape data a1 = reshape(a,[],2); b1 = reshape(b,[],2); plot(a1,b1) % plot(a1',b1') % another variant

7 days ago | 0

solving odes that matrices should be update in every step.
I made some changes in your code. Pay attention to refreshing parameters: function sdot = ODEFUN(t,x) g1 = interp1...

7 days ago | 0

calculation the angle betwen X-axis created due coordinate system rotation - after projection the coordinate system on the plane
Here is an idea of how to project axis onto plane: Unit vector (normal) of a plane: Distance to plane: Axis projected onto pl...

7 days ago | 0

how to generate a circel which filed with regular points?

7 days ago | 0

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Error solving Boundary value Problem using bv4pc function
Try r = 1e-3 I think you forgot about dydr(1) and dydr(3) function dydr = odefun(r,y,phi,chi) dydr=zeros(4,1); % dydr(1) =...

8 days ago | 0

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Convert patch isosurface to surf
Use griddata and meshgrid

10 days ago | 0

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ODE15s running slowly for ODE with long expressions
Moreover, whenever I paused the computation to see what was happening, it always paused in files like 'sym', 'char', 'size', 'di...

10 days ago | 0

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How to change the position of arrow in quiver from head/tail to middle of the line?
Use scale scale = 0.5; quiver(...,scale)

12 days ago | 0

Graph of time against angle for multiple values of theta
You'll have only 2 curves: a=1; g=9.81*100; theta = linspace(1,7,20)*pi/16; hold on for h0 = [30 40] tau = ((h0.^(5/2))...

12 days ago | 0

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how to solve this bvp4c?
I re-wrote the main equations (compare yours and mine) and tried b = 1 Check the attachment

14 days ago | 0

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Calculate the distance between objects area using matlab.
Use this I1 = edge(I); [m,n] = size(I1); ldist = zeros(1,m); for i = 1:m ind = find(I1(i,:)); % find ind...

15 days ago | 1

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how will i get a mesh in 2d region
I tried to simplify the task (plain rectangle instead of ellipse(cylinder)) Here is what i got clc,clear data = load('simpl...

18 days ago | 0

Find path between two points with X and Y coordinates
I reached a succes p = xlsread('coordinates'); x = p(:,1); y = p(:,2); plot(x,y,'.r') hold on for i = 1:length(x)-1 ...

22 days ago | 1

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How to find x range value and calculate average of corresponding peaks in a graph signal?
Try this; index = find(y>100); % find peaks ind = find( diff(x(index)) > 0.01 ); % find ...

22 days ago | 0

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How to integrate discrete values over a surface
If your mesh if fine enough you can just multiply sides (area of rectangle) For better precision cross product can be used

23 days ago | 0

when solving Gilmore equation using ode45 , the answer comes as zero and it plots a straight line in the time interval
Here is what i tried. Do you know the result should looks like?

24 days ago | 1

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Creating a Random Vector with Several Conditions
You can just rotate circle and select points you want. I used Rodriguez formula

25 days ago | 1