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darova


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604 total contributions since 2019

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Answered
how can i find the distance from the peak of one wave to another wave in a image?
I suggest next algorithm imcrop region of interest (since it's always at the same position imbinarize image maybe clear a bit...

2 hours ago | 0

Answered
How can I centre points of interest in an image before it's cropped and saved?
You previous code was ok i think. Just made some changes [ii,jj] = find(I5); % calculate boundaries i1 = min(ii); %...

3 hours ago | 0

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Answered
solving a system of equations where some variables are linked to a function
I tried fsolve %%variables that are known. m_3=0.004 ; h_3=1530; y_3=0.62; To=25+273; P_c=1.5 ; UA=0.5; hfg2=2256; ...

6 hours ago | 0

Answered
2D Temperature Distribution
I made some changes in your code X = 10; Y = 10; theta1 = zeros(X,Y); for n =1:100 theta1 = theta1 + (2/pi)*(((-1)^(n+1...

19 hours ago | 0

Answered
Max of vector in higher dimensional array subject to constraints
Use max() B = max(A,[],3);

19 hours ago | 0

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Plot straight lines between the data points in the same colour as the data points with lots of NaN values
Remove NaN? ind = ~isnan(y); plot(x(ind),y(ind),'or') Remember about accepting the answer if it helps

19 hours ago | 0

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Answered
How do you use ./ operator on array of custom class

19 hours ago | 0

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Answered
Transform RGB image to grayscale but keep format as RBG
You can use repmat or cat to create 3D matrix I1 = rgb2gray(I); I2 = cat(3,I1,I1,I1); % gray image as 3D matrix %I2 = r...

19 hours ago | 0

Answered
Excel data set to vectors
Use quiver function u1 = diff(x1); v1 = diff(y1); plot(x,y,'.r') hold on quiver(x1(1:end-1),y1(1:end-1),u1,v1) hold off

20 hours ago | 0

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Answered
How to rotate a rectangle
If you open (Ctrl+D) rotate function you will find these lines at the end: if strcmp(t,'surface') || strcmp(t,'line') se...

21 hours ago | 0

Answered
How to solve a differential equation system with ode15s
I made some correcitons. Try now

21 hours ago | 0

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Answered
Extract sub-matrix compute correlation coefficient 2D case iteratively
Sometimes i+1 > numcols. What will happen then? (RED) Left side has one number, right one - 4. (GREEN)

24 hours ago | 0

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How can I solve a system of differential equations including a bounded proportional controller?
Interpolate TL to choose correct value Don't use y(4) for Ct function dy=freylaw(t,y,time_min,TL) L=10; ...

1 day ago | 0

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Answered
Solve equations in a loop with fsolve
This is the correct form tau = 0.1 f4 = [3; 2; 6; 8] f8 = [2; 6; 7; 3] eq = @(s,f4,f8) s*tau-(0.1.*s^2+3.54.*s-9.53).*f4.^2...

1 day ago | 0

Answered
How to adjust colors of animated plot3 over time
Try this n = 100; colors = jet(100); x = linspace(0,10,n); y = sin(x); cla xlim([min(x) max(x)]) ylim([min(y) max(y)]) ...

2 days ago | 0

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2-D conduction in a aluminum plate
Your equation: Can be re-written as (difference scheme): You should express while 1 % loop until toler...

2 days ago | 1

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Answered
Plotting a Graph with Shapes and Colours
An example h1 = plot(1,1,'.r'); % red point hold on h2 = plot(2,2,'.b'); % blue point hold off legend...

2 days ago | 1

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Answered
How to plot error ellipses on the head of the quiver's arrows?
So my dataset is made of six coloumns: latitude, longitude, horizontal velocity, vertical velocity, horizontal uncertainty and v...

2 days ago | 0

Answered
Trying to automatically crop an image into several smaller images based on segmentation
Something like this clc,clear I = imread('image.jpeg'); I1 = im2bw(I); I2 = imdilate(I1,ones(5)); % imdilate to close...

2 days ago | 1

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Answered
Plot with symbolic value on x axis
Use numeric values to plot Use symbolic values to make labels h = plot(x,y) syms T x1 = x*T; set(h,'Xticklabel',x1)

2 days ago | 0

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alignment between thermal and color images
I usually use this simple scheme I1 = im2bw(RGB); I2 = im2bw(THERMAL); imshow(cat(3,I1*255,I2*255,I1*0))

2 days ago | 0

Answered
Selecting parts of gridded data- I Need Help. I want to know it's possible or not?
Here is my achievement clc,clear load points.mat load grid_datamat.mat p = table2array(Points); g = table2array(grid_da...

2 days ago | 1

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Answered
Unable to solve exercise using duffing equation
Where is blue part? You should use for loop to calculate for different gamma = 0.1:0.1:2; for i = 1:length(gamma) x1_...

3 days ago | 0

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Answered
Keypress to another program
What about ButtonDownFcn? function main x = linspace(0,10,50); y = sin(x); h = plot(x,y,1,1); set(gca,'buttonDownFcn',@...

3 days ago | 0

Answered
How to vectorise or speedup the code
Try pdist2 D = pdist2([Lat(:) Lon(:)],[lat(:) lon(:)]); % create every possible combinations of distances [i,j] = find(...

3 days ago | 0

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Answered
Solve ODE for the eigenvalue
I changed limits and the call of bvp4c xlow = -2; xhigh = 2; X0 =8 ; y10 = 1; y20 = 1; sol = bvp4c(@bvp4ode, @bvp4bc, soli...

4 days ago | 0

Answered
I need to save result of three loops in same file data if you possible for plot graphs or curves in 3D ?
example mass_ratio = 0.01:0.01:0.1; frequency_tuning = 0.85:0.1:1.15; damping_ratio = 0.01:0.01:0.2; displacement = zeros( l...

4 days ago | 0

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Calculating area under curve with cutoff
Don't know about vectorizing. Maybe this part will be simpler and faster load v.mat v = cumsum(v); v1 = v; dv1 = v*0; for i...

4 days ago | 0

Answered
How can I plot 2 fit curves in the same plot using cftool ?
Try this in second fit

4 days ago | 0

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Answered
How in Matlab R2019b fix error in ode45 solver command in solving a dynamic system consists of multiple ODEs equations?
Mistakes Also i suggest you to re-write your equations: dxdt(1,1) = delH*N-(1-u1)*lamH*(x(6)/N)*x(1)-delH*x(1)+alfa*x(3); d...

4 days ago | 0

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