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Plot the Planck's Radiation curves Below
x-axis and y-axis for the two plots have very different scales. So there must be an error in your formulae if we compare it to t...

4 years ago | 0

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

4 years ago | 0

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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...

4 years ago | 0

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Answered
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...

4 years ago | 0

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Answered
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);

4 years ago | 0

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Answered
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...

4 years ago | 0

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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...

4 years ago | 0

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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 ...

4 years ago | 0

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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...

4 years ago | 1

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Answered
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 ...

4 years ago | 0

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Answered
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) ...

4 years ago | 1

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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...

4 years ago | 0

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Answered
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)

4 years ago | 0

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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 ...

4 years ago | 0

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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...

4 years ago | 0

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Answered
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.

4 years ago | 0

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Answered
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,...

4 years ago | 0

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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 ...

4 years ago | 0

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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 = ...

4 years ago | 0

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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...

4 years ago | 1

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Answered
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...

4 years ago | 0

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Answered
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)

4 years ago | 0

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Answered
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...

4 years ago | 0

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Answered
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)

4 years ago | 1

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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...

4 years ago | 1

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Answered
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...

4 years ago | 0

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

4 years ago | 0

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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(-...

4 years ago | 0

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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...

4 years ago | 0

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Answered
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 ...

4 years ago | 1