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Extracting closed contours of streamfunction
Did you try this? https://in.mathworks.com/help/matlab/ref/streamline.html

4년 초과 전 | 0

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how to save variable as txt in a specified location with variable value appearing in the file name
path='c:/users/user/desktop'; filename = [path,filesep,'Gauss',num2str(width),'.txt']; fid = fopen(filename,'w') ; fprintf(fi...

4년 초과 전 | 0

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How to plot 3D filled contour ?
You can plot one level at a time: for i = 1:18 plot(lon,lat,levels(:,:,i)') shading interp drawnow end If you ...

4년 초과 전 | 0

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Index exceeds the number of array elements. Index must not exceed 3.
This error occurs when you try to extract more number of elements then present in the array. A = rand(1,4) ; % 1x4 array A...

4년 초과 전 | 1

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How to downsize image in x and y direction?
Read about imresize. img = imread('img') new_img2 = imresize(img, 1/2); imshow(new_img2)

4년 초과 전 | 0

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How do I refer to the next y point in a function?
You need to define x as an array, when you sustitue x in the function f, you will get output array y which is of same dimension ...

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How to make 3d plot to model logistic regression?
a0 = -3.936212854; a1 = 0.140718658; a2 = -0.102108952; m = 100 ; n = 100 ; C = linspace(0, 320,m); P = linspace(0, 0.58,n...

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How do I plot this beam, given the coordinates, distances between the nodes, and the connections, and the lengths of each segment?
Read about delaunayTriangulation. This would be easy to use to plot the shown. https://in.mathworks.com/help/matlab/ref/delaun...

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Making all Elements in Matrix Even.
a=[53, 59, 61, 87] ; iwant = a+mod(a,2)

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Retain all initial even value elements, add all odd values with 1
Hint: Read about mod. If mod(x,2) is 1 then x is odd. mod(4,2) % even number mod(5,2) % odd number

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Find position of the maximum value and then convert the row zeros and the position of the maximum value should become 1. just like in the image attach
A = rand(4) ; [m,n] = size(A) ; B = zeros(m,n) ; [val,i] = max(A,[],2) ; idx = sub2ind(size(A),(1:m)',i) ; B(idx) = ...

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Size of Q is undefined
You need to define the input variables and then call the function. It seems you are striaght away hitting the f5/ run button so ...

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How to find the contigous coordinate points between two varaibles datasets and do regression
idx = knnsearch(A(:,1:2),B(:,1:2)) ; B = B(idx,:) ;

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Simple logical conditional flag column
Simple, Let C1 , C2 be your two columns. C2(C1==1)=1 ; C2(C1==-1)=0 ;

4년 초과 전 | 1

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Problem for doing Monte Carlo Integration
Your y in the ocde is a anonymous function: function_handle with value: @(x)sin(x) You need to input some value into ...

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How to draw multiple plots in one picture?
subplot(411) plot(rand(100,1)) subplot(412) plot(rand(100,1)) subplot(413) plot(rand(100,1)) subplot(414) plot(rand(100,1...

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I want to arrange a 1st column of a matrix in descending order an the elements in the row is going to arrange itself according to change of the row of first vector
A= [3 2; 1 4; 2 6] ; [val,idx] = sort(A(:,1),'ascend') A = A(idx,:)

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how to write equation in matlab ?
If x is your series. N = length(x) ; FI = sum(abs(diff(x)))/N ;

4년 초과 전 | 0

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generate heat map based on lat/lon and data value
Let T be your grid... x = T.lon ; y = T.lat ; z = T.err_d ; % Convert the scattered data into grid m = 100 ; % can be...

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Reading and visualizing netcdf with vectors of differing lengths
If you want to attach the file, you can upload in some cloud spaces (google drive) and share the link here without asking the lo...

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Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.
The error is clear, you are trying to save more number of elements on the LHS then it is intialized for. Example: A = zeros(3...

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Load Files from folder based on file number
csvFiles = dir('*.csv') ; % you are in the folder where csv files are present N = length(csvFiles) ; for i = 1:N thi...

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Contour plot on a surface plot
A = load('Comsol_surf.txt'); x = A(:,1); y = A(:,2); z = A(:,3); % xg = linspace(min(x),max(x),1000) ; yg = linspace(min(...

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how to obtain random vector from the defined matrix
c=[1 2 3; 3 4 5;6 7 8;9 10 11;12 13 14;15 16 17]; [m,n] = size(c) idx = randsample(m,1) iwant = c(idx,:)

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Indexing a sub-variable in Matlab base workspace
This line: [ymin, index] = min(y); Your input to the function min is a structure. min takes an array as input. You need to cha...

4년 초과 전 | 1

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How do I save my values of x each time the loop goes round?
%IC clear x = 1; time = 0; dt = 0.1; %for loop calculating x after 10 iterations xx = zeros(10,1) ; for n = 1:10; k1...

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PSNR calculation for two photos
You have a inbuilt functions for that: Read here: https://in.mathworks.com/help/images/ref/psnr.html

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joining two timetables to complete the timeseries
You can fill the NaN values using fillmissing. Read about it.

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How to make colormaps like the attached colorbar?
Pick the RGB values of maximum value color you want and pick the RGB values of minimum value color you want to represent. Let ...

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Finding A String In A Specific Column of A Table (SQLite)
Read about strfind and strcmp.

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