Respondida
How would you make these for loops dynamically recursive?
Code available under https://de.mathworks.com/matlabcentral/fileexchange/7147-permn It's brute-force - thus caution: quite mem...

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Fitting a data with the best fit
Try "fit" with fitType gaussEqn = 'a*exp(-((x-b)/c)^2)+d' https://de.mathworks.com/help/curvefit/fit.html#d124e31956

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Different results using curve fitting app
Scale your problem: x = [262088, 323208, 390728, 464648, 544968, 631688]; y = [0.629, 0.64, 0.93, 0.972, 1.355, 1.56]; xscale...

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Obtain imaginary numbers in for loop but running code at each step on its own produces absolute numbers
diff = (1-(3.*((1-x(i)).^(2/3)))+(2.*(1-x(i)))) reac = (1-((1-x(i)).^(1/3))) instead of diff = (1-(3.*((1-x).^(2/3)))+(2.*(1-...

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Respondida
Matlab plot not showing correct values
v(i)=0.1553567*(i.^6)-2.0416*(i.^5)+9.1837*(i.^4)-14.829*(i.^3)-1.3703*(i.^2)+32.821*(i)-1.3155 instead of v=0.1553567*(i.^6)-...

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Respondida
how to plot a periodic function fro negative to positive?
T = pi; % period x = -10:0.1:10; % lets say your original function is y=2*x which repeated every T second, then y = 2*(mod(x-...

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Respondida
Not enough input arguments for my ode15s solver
options = odeset('Mass',E); E is not defined. x0 = [0; x0b ; 0]; x0b is not defined. [tout,xout] = ode15s(prime,tspan,x0,opt...

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Respondida
How can I build a objective function for a three phase induction motor?
Fobjt = sum((I1-I1est)./I1).^2+((eff-effest)./N1).^2+((fp-fpest)./fp).^2+((I0-I0est)./I0).^2,'All')

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Respondida
How to creat a loop to repeat the code with +1 to the input until the condition is met?
N=1728; sumcands = 0; while sumcands ~=4 N = N+1; b= [1:N^(1/3)]; c = nthroot(N-b.^(3),3); digits=10; ...

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Respondida
Combining elements from two arrays
A = [0.9572 0.1419 0.7922 0.4854 0.4218 0.9595 0.8003 0.9157 0.6557]; B = [0.8147 0.6324 0.95...

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Respondida
How to add "erf()" part to the ode solution?
syms x y(x) eqn = diff(y,x) - (-x+2+10*exp(-10*(x-1)^2)) == 0; cond = y(0)==1; sol = dsolve(eqn,cond) fplot(sol,[0 6])

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How can I select specific rows from a matrix when those row numbers are identified by another matrix?
If the row numbers in Matrix2 are already sorted: Matrix3 = Matrix1(Matrix2,:) Else sort them first.

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How to plot a math function with a vector
Then maybe T_j_scalar_t = @(t) integral(@(tau) P(tau) .* dZ_th(t - tau), 0, t); T_j = arrayfun(@(t)T_j_scalar_t(t), cooling_ti...

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Respondida
How to fit a smooth curve on discrete data.
Maybe something like this: x = [3, 2.5, 2, 1.5, 1, 0.5]; y = [1.8, 1.75, 1.71, 1.55, 0.8, 1.25]; plot(x,y) xx = linspace(x(1...

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Respondida
Using ODE Event locations: how to implement more than one event with different following solver decisions?
sol.ie as return parameter from the solver indicates which of the events you defined became active. According to this value, the...

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Respondida
How can I solve a Lagrange equation?
syms x1 x2 x3 lambda g = x1+x2+x3 - 10; L = 12*x1-x1^2+8*x2-x2^2+18*x3-3*x3^2+lambda*g; Lx1 = diff(L,x1); Lx2 = diff(L,x2); ...

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Respondida
How to plot function f(x,y,z)=c ?
c = pi/2; f = @(x,y,z) cos(x) + cos(y) + cos(z) - c fimplicit3(f,[-pi pi -pi pi -pi pi])

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Curve fit but only for the values that exists with defined values of x.
load census I = cdate >= 1850 & cdate <= 1950; cdate1 = cdate(I); pop1 = pop(I); plot(cdate,pop,'o') %Create a fit option...

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Respondida
How to find the timestep in ode45?
p(t) represents injection into the body at a rate of 2mg/min. So p(t) depends on the difference between the current and previo...

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Respondida
error in fminbnd and in my live function
Don't you have to include the circular area G = pi*r^2 at the bottom ? Then add pi*r^2 to A as indicated below. V = 10; % c...

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Respondida
Solving a PDE symbolically
First check whether (dH/dx1,dH/dx2) is conservative. Then you can reconstruct H by using H(x1,x2) = H(x10,x20) + integral_{z=x...

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Respondida
Not sure how to go farther with this problem.
n = 8; TD = zeros(n); for row = 2 : n-1 TD(row,(row-1):(row+1)) = (row-1):(row+1); end TD You will have to add the set...

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Respondida
how to plot the gradient of a equation having specific region?
x = -2:0.1:2; y = x; [X,Y] = meshgrid(x,y); f = @(x,y) -15*x.^2+4*y; surf(X,Y,f(X,Y))

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Respondida
Differential equation not working
I = @(t)100*sin(2*pi*t);; dIdt = @(t) 2*pi*100*cos(2*pi*t); V0 = 0.1; fun = @(t,V,I,dIdt) V/I(t)*dIdt(t)-V/0.01*(V*I(t)/250-1...

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Respondida
what is the problem of my code doing inverse Poisson cumulative distribution?
lambda = 10; u = 0.6; m = iPoisson(lambda,u) m1 = icdf('Poisson',u,lambda) function m = iPoisson(lambda,u) if u == 1 ...

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2D Finite Difference Method
K_11 = (f1(a(1,i)+h,a(2,i))- f1(a(1,i)-h,a(2,i)))/(2*h); K_22 = (f2(a(1,i),a(2,i)+h)- f2(a(1,i),a(2,i)-h))/(2*h); K_12 = (f1(a...

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Respondida
programming and plot equarion
z = -5:0.01:5; f = 2*z/sqrt(pi).*hypergeom(0.5,1.5,-z.^2); plot(z,f)

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Respondida
please guide me how to make plot from –pi to pi.
k = 6 + 6; size = 30 + 9; t = linspace(-pi,pi,1000); X = size * cos (k*t) .* cos(t); Y = size * cos (k*t)...

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Respondida
How do fix this code to give me the error?
Cp = @(T) .00000000747989.*T.^3-.000028903.*T.^2+.0423484.*T+36.1064; H = @(T) 1/4*.00000000747989.*T.^4-1/3*.000028903.*T.^3+1...

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Respondida
Plotting symbolic equation along an array.
Is the really the function you calculated the Fourier series of ? L = 10; nx = 100; nmax = 200; x = (linspace(0,L,nx)).'; n...

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