Respondida
Why is MatLab outputting 0s instead of the value?
E2 = (-1./(1+sec(x)))' instead of E2 = (-1/(1+sec(x)))'

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Respondida
Any comment to speed up the sum calculation of a function which includes legendre polynomials?
M = 1000; x = linspace(-1,1,M).'; y = x.'; for i = 1:11 Lpix(:,i) = legendreP(i,x); Lpjy(i,:) = legendreP(i,y); en...

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Respondida
matrix simultaneous equations returning 0s
Ax = 0; Ay = 0.25; Bx = 0; By = 3.25; Py = 30 + 3.5118*7; x=0.5:0.5:4; nx=length(x); y=-1:0.5:5; ny=length(y); xM=zeros(2...

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how to store every value that i get from each iteration of for loop ?
k=1 f=2 t=rand(100); an = sin(2*pi*(2*k-1)*f*t)/(2*k-1);

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Respondida
How to find second intersection point?
x1 = 0:0.0001:1.5; f1 = 1./x1; f2 = sqrt(5./2 - (x1.^2)); Intersections = find(abs(f1-f2)<0.00005); xvalues=x1(Intersections...

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Respondida
Heat transient equation not executing
The terms in your series do not agree with the formula you posted. You must decide which one is correct and which one is wrong...

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Respondida
How to keep a specific value in binary matrix with column constraint?
@Maria Your last question was quite interesting - so I invested some time ... If A becomes larger, you will have to work with ...

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Respondida
How to solve a large symbolic system of equations with boundary conditions
Don't solve symbolically, but numerically if you plan to work with so many equations. clearvars; clc %--- Cantidad de elemento...

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Respondida
Why are the output variables, that I expect to be real, complex?
%Constant parameters% a = 0.005; %sheet half thickness% eps0 = 8.9*10^-12; %vacuum dielectric constant% eps_2 = 80; %water ...

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Euler method table problem.Why my fprintf(y(i+1)) only has the last ans, my y1-y(i+1) is incorrect and how to let the table be tidy?
h=0.002; x=0:h:1; y=zeros(size(x)); y(1)=0; n=numel(y); y1=exp(x)-x-1; for i=1:n-1 f = x(i)+y(i); y(i+1) = y(i) ...

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Respondida
Parameter adjust for complex functions
fminsearch also works with functions, not only function handles. fun = @(f)FUN(f(1),f(2),f(3),f(4)); f10 = ...; f20 = ...; f...

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Respondida
I have a 1x6 array X = {‘a’,’b’,’c’,’d’,’e’,’f’}. I want a command that returns the element of X that contains a particular string. E.g. a command that if I tell it to find ‘d
str = ["asdfsd","bfgfd","cyf","ddfhf","effdg","dgdgdf"]; pat = "d"; [~,i] = find(contains(str,pat)==1)

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Solving constrained differential equations
Solving the above system is only possible in the form M = [1 0 0 0 0; ... 0 m1 0 0 0; ... 0 0 1 0 0; ... 0 0 ...

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Respondida
Please how do I get rid of local variables may have been changed to match the globals error?
Can you take it from here for your case ? f = @(x,a) x.^2 + a.^2; x = -2:0.01:2; a = 0:0.1:1; array = zeros(numel(a),numel(x...

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Respondida
How do I add "internal" upper and lower bounds to the function lsqcurvefit?
The condition lambda_1 <= lambda_2 has to be set in A,b of the mimimizer "fmincon". "lsqcurvefit" is not suited in this case.

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Respondida
What is the pdf of Jakes' Model
You mean the equation of the pdf in the histogram ? theta = rand(1000000,1); v_max = 1.0; v = v_max*cos(theta); histogram(v,...

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lsqcurvefit with custom equation
The saturation concentration for your model is 9.35e-4. So you will never reach 5.6e-3 as in your data. Note that the infinite ...

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Respondida
how to plot this equation
syms x y k f = y^3 + k^2*y^2 + k*y + 3; s = solve(f==0,y,'Maxdegree',3); s1 = sqrt(s); s2 = -sqrt(s); k = 0:0.1:10; s11 = ...

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Respondida
How to convert this equation to a matlab code?
It's written as it stands: a = 0.5*[1-zeta.^2,2-zeta.^2,1-alpha,2-alpha,1-beta,2-beta]; b = [1]; c = 0.5*[0,1]; d = 0.5*[-ze...

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Solving a system of equations symbolically
Better ? syms F0 R1 R2 d1 d2 d12 thta thta12 m1 m2 assume(thta12,'real') assume(thta, 'real') assume(thta~=0) eq1=((F0/R1...

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Unable to integrate a function using integral and vpaintegral
syms x theta = 6.3*pi/180; f = (1+cosh(2*theta*x))/sinh(2*pi*x)*tanh((pi-theta)*x); vpaintegral(f,x,0,Inf)

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Changing for loop to backslash
A = [6 -1 0 0 0; -3 3 0 0 0; 0 -1 9 0 0; 0 -1 -8 11 -2; -3 -1 0 0 4]; b = [10:10:100;repmat([0; 160; 0; 0],1,10)]; dA = decomp...

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Respondida
my question is after ploting (x,y) , i want to count the number of signals that is above 0.5 at time for example : 1.05e-7, how to do that in matlab
xx = 1.05e-7; [~,i] = min(abs(x-xx)); count = nnz(y(i(1),:) > 0.5)

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Respondida
Fitting a hyperbola through a set of points
Remove the NaN value in the last position of data.P2 and data.I2: clear all; data=readtable("https://de.mathworks.com/matlabce...

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Respondida
How to segregate data according to its temperature value?
Use MATLAB's "discretize" for the temperature array and use the so received vector Y of bins to split the vector of water levels...

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Respondida
Options for solving a system of non-linear equations
"fsolve" is the only MATLAB tool to be used for this purpose.

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Respondida
How can I calculate the moments of an exponential random variable
syms mu x lower upper n assume(n,'integer') assume(n>0) lower = 0; upper = 5; mu = 3; f = 1/mu*exp(-x/mu) / int(1/mu*exp(-...

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Data plot for different values
%store your outputs for each xi thetaxivalues(ixi,:,:) = theta(:,:); vxivalues(ixi,:,:) = v(:,:); What is ixi ? I guess, it's...

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Respondida
How to interchange position of a matrix?
Are you sure that the changes should be performed subsequently with the new vectors obtained from the steps before ? My guess ...

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Respondida
why error occurring in the program, i already define the z1 correctly i think?
Where do you define z1(1),z2(1),z3(1),z4(1),z5(1), x1(1),x2(1),x3(1),x4(1),x5(1), o1(1),o2(1),o3(1),o4(1),o5(1) needed to st...

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