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Plotting chemical 2d reaction in different colors
What about alpha? Try to set transparency to your object and then just plot them together [X1,Y1,Z1] = peaks(20); [X2,Y2] = me...

environ 6 ans il y a | 1

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For loop that extracts non constant values from a column in an Excel table and outputs the desried value of the selcted row
Use logical operators for this purpose num = xlsread('Testing.xlsx'); tbl = num ; col_2 = tbl(:,2); % Column of values val...

environ 6 ans il y a | 0

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ode45 change function index when something happends
Try persistent variable function main clc % clear command window clear functions % clear persiste...

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Surface plot with custom data tip
Use griddata to interpolate your data xx = linspace(min(X),max(X),20); yy = linspace(min(Y),max(Y),20); [X1,Y1] = meshgrid(xx...

plus de 6 ans il y a | 0

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Simulating lots of non-interacting particles bouncing around in a 2D box
Here are some notes you can make your code shorter Didn't you forgot about timestep? Use this part of code to check if so...

plus de 6 ans il y a | 0

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function area = calcarea(rad) ↑ Error: Function definitions are not permitted in this context.
See this simple solution

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How to draw a tangent line to the curve?(tangent line has to pass through origin)
Here is the success condition: Numerical approach dx = 0.1; f1 = @(x0) (interp1(x,y,x0+dx) - interp1(x,y,x0))/dx; f2 = @...

plus de 6 ans il y a | 0

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MATLAB Count multiple spheres with overlaps, known number of pixels per sphere, no 3D data available
How to know if sphere are too close? Try to separate them using imdilate I = imread('img1.png'); I1 = im2bw(I); se = strel('d...

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Contour map to show ocean depth
Use griddata % lat, long, depth - your data [LAT,LON] = meshgrid(lat,long); % create 2D matrices DP = griddata(lat,lo...

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Plotting Inclined Rankine Oval
Here is a formula And this is how surface looks like originally Here is the problem part My suggestion is to plot only...

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How do I apply a tolerance to my code
Use this trick

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Find the time of each collision on a wall of a ball in a 2d box.
See this simple example clear, clc vx = 10*cosd(-30); vy = 10*sind(-30); g = 9.81; % gravity x = 5; % start x y =...

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How to define a system of differential equations with three variables and calculate their variation with time?
Since your matrices are of 3x3 size the result should be of 3x1 size function dydt = dynamics(t,y,Mt,Ct,Kt) dydt = zeros(6,1);...

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how to increase getframe dimensions and quality ?
Try this madness clc,clear,cla wobj = VideoWriter('test1.avi'); wobj.FrameRate = 10; % frames per second (vi...

plus de 6 ans il y a | 4

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Help with a script that calculates bending moment of cantilever beam.
I think you are overcomplicated. Look on this idea

plus de 6 ans il y a | 0

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reshape a photo to 8*8 blocks
Use mat2cell [m,n] = size(img); im = 8*ones(1,m/8); in = 8*ones(1,n/8); img1 = mat2cell(img,im,in); img2 = cat(3,img1{:});

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How to replace data a specific portion of data within a column of different dimensions?
Here is a trick A1 = load('data1.txt'); A2 = load('data2.txt'); ix = 410:459; A1(ix,1) = A2(ix,1); writetable(table(A1),'da...

plus de 6 ans il y a | 0

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Hi ,i have problem whit the function quad
Make this modifications

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Draw a symmetrical shape on the x-axis, y-axis, and origin using the transformation matrix
I used patch x = [3 3 2 3 5 6 5 5]; y = [1 3 3 4 4 3 3 1]; cla patch(x,y,'r'); patch(x,-y,'r'); patch(y,x,'r'); patch(-y,...

plus de 6 ans il y a | 0

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Not getting direction field for an ode in a proper way.
Correct answer

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How can I plot this figure using MATLAB?
Here is patch use x = 0:0.1:1; y = sqrt(x); cla patch([0 0 0],[0 1 0],[0 0 1],'b') % vertical triangle patch([1 0 x],[...

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double summation in matlab
Here is numerical approach clc,clear % alignComments b = 0.142e-9; gammao = 3.0; m = 101; hbar = 1; e ...

plus de 6 ans il y a | 1

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2D images into 3D plot
Create 3D object (surface maybe) and use rotate h = surf(peaks); orig1 = [ 0 0 0 ]; ang1 = 15; dir1 = [ 1 0 0]; rotate(h,di...

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Calculating mean angles of edge detection
Try regionprops with orientation property Example BWd1 = 1.0*BWd; data = regionprops(BWd,'orientation','pixelidxlist'); % g...

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How would I integrate different values into 4 tables?
Try this solution

plus de 6 ans il y a | 0

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Solving stiff ode system with vector parameters.
I found the problem

plus de 6 ans il y a | 0

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Pre-define a group (plot) properties or passing a group properties in a function
You can use handlers h(1) = plot(..) h(2) = plot(..) set(h,'color','r','linewidth',2)

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Geoshow and pcolor not plotting correctly
See this example clc,clear clf peaksData = ncread('example.nc','peaks'); [m,n] = size(peaksData); [lat,lon] = ndgrid(1:m,1...

plus de 6 ans il y a | 0

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How to create animation of wave pattern h(x,y,t) = Acos(2*pi*t/T-2*pi*x/L) with T=4s , L=12m, -300<=x<=300, -300<=y<=300 , 0<=t<=20
Here is the solution

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ODE45 in Maxwell-Stefan equation
Here is the solution: f = @(t,y) 1/c/D*(y*(NH2+NH2O)-NH20); [t,y] = ode45(f,[0 2.5e-4],1);

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