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Computational Electromagnetics and MATLAB

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Why am i getting the : errir using inv ,Matrix must be square?
As James Tursa said, inv(H) is not defined when H is not square. If you have the matrix H and the rhs g, simply use f = H\g;

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Struggling to Vectorize the following Code.
Almost all execution time is due to the plot function as highlighted by the profiler: You can call the plot only once at the ...

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How can I pick certain element from each row of an array ?
I see that the edges shared by two triangles are not duplicated. To check for this case I sorted the nodes and the edges. Let me...

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Combining my newton's method function for nonlinear equations and my lu decomposition function.
Is this what you are asking for? delta = LUgauss(J(x0),-F_value); Note that the buil-in lu Matlab function can do the work for...

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How to sum over rows within specific ranges without for loop?
Not sure if it is the best way, but this seems to work index = [0; cumsum(B)]; C = cell2mat(arrayfun(@(i)sum(A(index(i)+1:in...

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Removing Outbound (out of range) data from an array
% dimension N = 1000000; % data in (0,1) x = rand(N,1); % threshold xMin = 0.25; xMax = 0.75; % remove data out of ...

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How to select specific values and corresponding cell positions from 31 x 12 matrix?
Because the number of rows in B is not fixed, you can store the result of your check in a cell array % create the matrix A = (...

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I have a problem with integration "Error using / Matrix dimensions must agree"
When you define your functions use ./ instead of / %function f=(x+(1./x)).^2; %real value of integral ff=@(x)(x+(1./x)).^2;

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Cause of: "Error: Inputs must be floats, namely single or double."
What I can see is 1) Fs is missing. In any case, tspan shpuld be a 2 entries array with initial and final values tspan = [0,15...

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how to convert cell to matrix ?
A = cell2mat(cellfun(@str2num,x,'UniformOutput',false))

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Possible to modify only one portion of an array in one line?
x(x > xMax & 1:length(x) > transition) = xMax

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How to compare the closest value in the matrix?
% your data unknownM = [0.8105 1.1581 0.6295 0.9594 0.8447 0.7103 0.8429 0.5372 0.9882 0.8924]; sud...

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how can I create a 4D matrix and use it for interpolation
% your vectors Wpig=0.5:0.5:7; Chla=0.5:0.01:0.6; Starch=0:0.04:0.24; Now you need to sample uniformly the space using your...

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How can i break down the values of vector into group of five?
If x is your vector you can reshape it y = reshape(x,5,numel(x)/5); and access each column with indexing % column 10 iCol = ...

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index in position 2 exceeds array bounds ( must not exceed 1).
Difficult to say without file, code, etc. The wizard says that the new excel file has only one column, but the code expects tw...

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if statement in for loop with cell arrays
To stick with the OP snippet I added semicolons all over the place I changed the variable type in s.score to doubles I preall...

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How to create an array and fill it by these values using loop ?
% intialization and preallocation k = 1; date = strings(480,1); % string array for i = 1982:2015 for j = 1:12 ...

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Monte Carlo integration of sin(x)
This code evaluates the integral using the Monte Carlo method with increasing number of random samples, compare the result with ...

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Check if a number is in between two values
% your data a = [1,2,3,4,5,6]' b = [10,11,12,13,14,15]' Interval = [a b]; % number to check x = 8; % this finds the in...

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Assembling Element Matrices in Finite Element Method Problem
If I have understood correctly, you want to store the local 3x3 matrix in the global matrix. To do so you can (I would say must)...

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How to find corresponding row positions of specific values in a matrix?
The function min will do this for you [B,C] = min(A,[],1);

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How to convert script from fortran90 to matlab language
Again, it is difficult to check if not all code is available, however I try kB = zeros(10,1); kA = zeros(10,1); kL = 0; kS =...

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Pad with Nan according to maximum row in cell
I keep all steps separated % the data A = {rand(47,1),rand(80,1),rand(97,1)}; % pad with NaNs A = cellfun(@(x)[x(1:end); N...

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Keeping Previous Iteration changes
I see two problems in your code 1) the changes are only temporarily saved in x and x is never used 2) onec you change a letter...

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How to get rid of Nan when calculating mean
Following Steven Lord answer I would usE mean(A(isfinite(A)))

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Why is my script not working?
I try 1) I think you are caluclating the jacobian matrix. To avoid mistakes I did this symbolically and the result is >> syms...

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Parallelogram rule for vectors
Vtot = V1+V2+V3+V4

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Extract values from image
I assume you have X,Y and B as created using meshgrid, and the line is specified by start/end node % create dummy data x = lin...

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Help with nested for loop generating coordinates
The command you are looking for is meshgrid % vectors with positions x = 0.00470:.0003:.0071; y = 0.00470; z = 0:0.00005:.00...

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