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Error using ode45. Must return a column vector?
1x20 is not a column vector, but a row vector. transpose it to 20x1.

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Remove NaN ?
input -> matrix (n*m) with at least one element equal to NaN; output -> matrix(p*m), the same matrix where we deleted the enti...

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Back to basics 21 - Matrix replicating
Covering some basic topics I haven't seen elsewhere on Cody. Given an input matrix, generate an output matrix that consists o...

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Back to basics 23 - Triangular matrix
Covering some basic topics I haven't seen elsewhere on Cody. Given an input matrix, return a matrix with all elements above a...

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Why I cannot define a function in live script?
Hi, you are right - it is freezed: But there is nothing wrong with this, since you can not run a function which is defined b...

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gauss elimination or inverse
Hi, use polyfit to do this. Best regards Stephan

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How to find the running time of the program if I use optimization toolbox?
Hi, maybe you are looking for timeit or for tic / toc. Best regards Stephan

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When I integrate a constant over Tp I should get the constant but I don't?
Hi, int is a Symbolic Toolbox function. Use either double or integral for direct numeric computation. a0 = double((1/T)*int(10...

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ODE Solver Running Very "Slowly"
Hi, it is a very bad idea what happens with B_test.m while the solver runs: In every call of the ode function by the solver B_...

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How to assign the value for Integer variable indices in GA toolbox?
Hi, consider you have 8 variables x(1)...x(8). The following code makes x(1), x(2), x(4) and x(6) integer constrained in range ...

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Evaluate matrix equation at multiple timesteps
Hi, try: R=[1 0.5; 0.5 1]; M0=[1;1]; u0=[1;0]; x=repmat(linspace(0,1,100),2,1); y = zeros(2,size(x,2)); f=@(x) expm(-R.*x...

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Order of the Matlab Ode Solutions Appearing at Output?
Hi, unfortunally Matlab sometimes changes the order of outputs to an order which appears not be logical (at least for me). I do...

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odeToVectorField: Unable to convert the initial value problem to an equivalent dynamical system.
Hi, i deleted my first answer - cause your comment brought me to a new thought - DAE: syms t v1(t) v2(t) v3(t) eq1 = v1(t) ==...

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i have installed latest version ..... and i cannot find simscape electronics module in that and how to add that one
Hi, Simscape Powersystems and Simscape Electronics have been bundled to Simscape Electrical: https://de.mathworks.com/help/phy...

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Using summation containing function for curve fitting
Hi, you can use this script: x0 = [12 3]; x = lsqcurvefit(@(x,t)equation_fit(x,t),x0,t,S) S_calculated = equation_fit(x,t); ...

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How to solve in MATLAB 2018b ???
Hi, the following runs for me in 2018b: clear all % State equations syms x1 x2 p1 p2 u; Dx1 = x2; Dx2 = -x2 + u; % Cost f...

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how can I solve an error of a different number of elements in GA multiobjective optimization?
Hi, try: % Optimize with gamultiobj fitness =@levulinicAcid; nvars = 2; [x,fval] = gamultiobj(fitness, nvars, [],[],[],[],[...

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How can I plot a matrix's values greater than a value as dots
[x,y] = find(X>1) scatter(x,y,'ro','MarkerFaceColor','r') xlim([0 400]) ylim([0 400])

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It says "too many output arguments" when I try to run the function. Why?
Hi, if you change the number of output arguments of a function, make sure to that the number of output arguments in your functi...

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How can I plot an impulse response h(t) sampled with fs?
Hi, for me your code is running (made some assumptions and a small edit at the plot): % I assume that s1...s4 are scalars and ...

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Whys isn't this if working?
Hi, consider: >> intervalo = 0 intervalo = 0 >> quant = 0 quant = 0 Now case 1 - what you told Matla...

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plotting a column of a timetable
Hi, the quotes tell you, that Matlab does not interpret this values as numbers but as datatype char. You can check data type f...

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Support vector machine classifier
Hi, i recommend to use the classification learner app to do this. The advatage is, that you dont have to write code to do this ...

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Reshaping an array of n rows in a custom way
B = [unique(A(:,1)) reshape(A(:,2)',[],3)']

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fminunc error message multiple variables

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Can you find the error in this code that aims to sum the digits of a string?
Hi, try : n = '12361927' s=num2str(sumdigits(n)) if strlength(s)==1 s=s; disp('here') else while strlength(s)~=1...

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How I can create a three dimensional succession
freq(1,1,:) = (5:0.5:15)*1e9;

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fminunc error message multiple variables
Hi, fminunc is only able to pass the optimization variable to the objective function. Since your function needs additionally in...

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Estimating a function in matlab using different values of parameters froma matrix/dataset
Hi, no datasets needed i think, a=-4. syms r x a fun = (2*(r - 1))/(90 - x)^r - (4*(r - 1))/(2*x + 90)^r + (a*(r - 1))/(2*(90...

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Loading indexed .mat files using a for loop
Hi, maybe this function from FEX will help to create the needed file names: Numbered Filename Array Best regards Stephan ...

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