Solving nonlinear DE by reduction of order on matlab
There are some typos in your description of the problem. Here the correct version % your ODE - note that (y(1) and y(2) are exc...

11 months ago | 0

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creating array based in another array
Here a possible solution, where all arrays you want are in the columns of matrix a2 % number of entries in array 1 n = 5; % c...

11 months ago | 0

Warning: Matrix is singular to working precision.
The matrix is singular because the first three rows are linearly dependent. For example you can obtain row 1 as I guess there...

11 months ago | 0

how can i let all number in matrix X between 0~1?
If you want to scale your output in [0 1] you can use this X1 = (X-min(X))/sum(X-min(X)); in fact >> sum(X1) ans = ...

11 months ago | 0

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how to shift the plotting graph?
Not sure if it is what you want, but you can change the x-axis limits in this way: set(gca,'xLim',[5 20]) to show the portion ...

11 months ago | 0

Question

Real time GMRES convergence and stop callback
Dear Matlab users, I usually solve large linear problems using gmres. These simulations could last for several tens of hours. T...

11 months ago | 0 answers | 0

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Population growth in 7 years
Below you can find the output of the following code % rate r = 0.0063; % years t = 7; % initial population a = 5e6; t =...

1 year ago | 1

Question

Problem with Simscape variable visibility
Hi all, I have created a simulink model of a circuit using simscape electrical elements. I have also created two callbacks, Ini...

1 year ago | 1 answer | 0

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how to find parallel of resistors
Maybe it's too late for the OP, but for the records, I usually use an anonymous function with multiple inputs % ananymous paral...

1 year ago | 0

Nonlinear equation numerical solution
% params C = 1.2; D = 9420; E = -2.0; B = 0.1973; y0 =...

2 years ago | 0

Plotting a taylor series function of x^(1/3) centred at x=1728
One option is to use the built-in taylor function in symbolic math toolbox. If you want to use your strategy, there are some is...

2 years ago | 0

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Memory efficient alternative for meshgrid?
This is how to make the three-loop version analogous to the meshgrid version % some dummy values N = 300; x = linspace(1,10,N...

2 years ago | 0

Sorting Equal Elements of Matrix into Groups in Cell Array
I had the same problem to detect isolated nodes in a graph: conncomp is the matlab command that gets the job done: % create the...

2 years ago | 0

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Error using / Matrix dimensions must agree...
f is a vector, as well as W. So you must use the dotted version of the division (that is ./ that performs the operation elementw...

2 years ago | 0

Question

Copy Matlab Command Window without diary
Hi everyone, I would like to add an optional function command at the end of a script that logs the command window to a file. I...

2 years ago | 2 answers | 0

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Is it possible to create a program on matlab that's works on android?
Sort of https://it.mathworks.com/help/supportpkg/android/run-on-target-hardware.html?s_tid=CRUX_lftnav

2 years ago | 0

How to improve my code speed (for loop)
By profiling, the most computational intensive operations are x=T*(probe-ut)'; y=T*(gallery-ut)'; That calculation is inside ...

2 years ago | 0

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How to optimize only 2 variables in an objective function with 3 variables?
In this case you can set the upper and lower bound for that specific variable to the same value. Maybe it is not efficient but i...

2 years ago | 0

How to optimize only 2 variables in an objective function with 3 variables?
Why don't you remove theta from your objective function definition and call different_function inside function? function object...

2 years ago | 0

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How to change a column vector into a square a matrix?
Not as elegant as it could be but it works, especially for small matrices % matrix dimension n = 3; % your entries (here du...

2 years ago | 0

Calculate acceleration from velocity and time fron excel
acceleration = diff(data.Velocity)./diff(data.Time); Note that this vector has one entry less than the original ones, so you ma...

2 years ago | 0

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Subscripted assignment dimension mismatch.
You can use repmat and create a char array function bigstring = string_multiplication(str,N) bigstring = repmat(str,N,1); ...

2 years ago | 0

Simulation errors when multiplying matrices
I start a new clean answer You don't have to use the index i inside your matrix like you are doing in your code: in that way yo...

2 years ago | 0

Solving Complex Matrix Operations
You can do this in a for loop or using arrayfun % your A vector A = rand(1,1001); % dummy vector % calculation of the matr...

2 years ago | 0

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Replicate values in a matrix i-1 times
Quick and dirty for loop A=[1; 4; 8; 3; 2; 6] B = []; for i = 1:length(A) B = [B; repmat(A(i),i,1)]; end You can als...

2 years ago | 0

Find independent variables that minimize function
If you have only lower and upper bounds, use them directly in fmincon % your function fun = @(x) ((x(1)-real(0.5*(x(1)-(sqrt(x...

2 years ago | 0

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Simulation errors when multiplying matrices
Inside the loop in the first instruction Vn(:,i) is 5x1 but T is 5x5. Matlab now (starting in 2016, I guess) implicitly expands ...

2 years ago | 0

Weighted fit using fmincon
How about to repeat the samples of the points you want to weight more?

2 years ago | 1

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