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Using anonymous functions with vectors of unknown number of elements and getting the coefficients associated with the variables
Then n_s = 2; u = randi([-9999, 9999], 1, n_s) c = sym('c',size(u)); kappa = expand((1+u*c.')^2) coefficients = coeffs(ka...

etwa 4 Jahre vor | 1

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Nonlinear regression not working
clc; clear all; input0= [160 159 158 157 156 155 154 153 152 151 150 149 148 147 146 145 144 143 142 141 140 139 138 137 136...

etwa 4 Jahre vor | 0

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Find close points in two matrices of coordinates
Use "pdist2" to calculate the distances of the sites of the first set to the sites of the second set. Check which rows of the d...

etwa 4 Jahre vor | 0

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How to fasten the loop
Maybe there are faster commands than arrayfun for extracting the elements of LONG in cell arrays that correspond to sequences of...

etwa 4 Jahre vor | 0

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Normal random number generation
pd = makedist('Normal'); t = truncate(pd,0,1); r = random(t,1e6,1); figure(1) histogram(r,100) Or directly: r = -sqrt(2)*e...

etwa 4 Jahre vor | 1

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cumsum function question for integration
cumsum(y_cos*inter_val); is a Riemann sum for the integral of sin(t) - integrated between 0 and x. But the integral of sin(t) ...

etwa 4 Jahre vor | 1

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I want to do exponential fitting for power decaying with time
x=[ 65.10 1.0000e+000 65.90 61.0843e-003 70.30 21.3693e-003 ]; fun = @(p)exp(-p*(x(:,1)-65.1)); f...

etwa 4 Jahre vor | 0

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How to define an ellipse by the eigendecomposition of its transformation matrix?
phi = linspace(0,2*pi,100); S = [1 0;0 4]; xy = S*[cos(phi);sin(phi)]; theta = pi/4; Sxy = [cos(theta) -sin(theta);sin(theta...

etwa 4 Jahre vor | 2

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I have some coupled nonlinear ordinary differential equations. Three equations have three 2nd order derivative coupled together. Can someone tell me how I can get the response
Solve the third equation for theta_dotdot and insert this expression in equations (1) and (2). Then use the usual substitution...

etwa 4 Jahre vor | 1

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When calling a user defined function, MATLAB throws an error for simple matrix multiplication
"const1" and "const2" are not visible in "planck_function" since you didn't declare them as "global" in the calling program. Bu...

etwa 4 Jahre vor | 0

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How can i use optimproblem as a free derivatives method?
https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=8736798

etwa 4 Jahre vor | 0

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how to use symsum for this problem
If you use symbolic variables, you should name them as such. And you shouldn't name a variable "sym", especially if you do symb...

etwa 4 Jahre vor | 0

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How to code Flux Boundary Conditions for a PDE using ODE15s and method of lines
One of many possibilities: dc/dr = 0 c2 - c1 = 0 -> dc1/dt = dc2/dt De*dc/dr = kf*(C-c) De*(cn-c(n-1))/Vl_stage = kf*(C-...

etwa 4 Jahre vor | 0

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Error: Not enough input arguments
r = [2.5 1.2 0.45]; y0 = [1 1 0 1 0 0]; tspan = linspace(0,5); soltrue = ode45(@(t,y)diffun(t,y,r),tspan,y0); yvalstrue = de...

etwa 4 Jahre vor | 1

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how to use derivative of function using gradient?
Add the variable "dens_mix" as an algebraic equation to your system (e.g. as y(13)): dydz(13) = y(13) - (partial_dens(1)+partia...

etwa 4 Jahre vor | 1

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Why fsurf show anything for my function?
Is this an explanation ? clear syms eta__2 zeta__2 Hvs2 =((2305843009213693952*(eta__2 - 8331386150863307/9007199254740992)^...

etwa 4 Jahre vor | 0

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Curve Fitting Toolbox for Surface Extrapolation
[fitresult, gof] = fit( [xData, yData], zData, ft, opts ); xq = (xData(1)+xData(2))/2; yq = (yData(1)+yData(2))/2; zq = feval...

etwa 4 Jahre vor | 0

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dsolve unable to find symbolic solution to sets of ODE
The equations are much too difficult and the size of your ODE system is much too large to be solved symbolically. Use a numeric...

etwa 4 Jahre vor | 0

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Vectorization: incompatible sizes of arrays
n_p = 3; n_o = 3; P = rand(n_p,2); R = randi(n_p,n_p*n_o,1) IP = (cell2mat(arrayfun(@(i)vertcat(repmat(i,1,n_o)),1:n_p,'Unif...

etwa 4 Jahre vor | 0

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how to remove error in the code?
And where is the fiunction "star4" ? Your call should be [t,C] = ode45(@star4, t, C0); % Solve the system according to the tim...

etwa 4 Jahre vor | 0

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How can I segment a matrix based on the difference between a column's elements of the matrix?
X=[ 8.3700 -53.3090 11.4000 -116.6670 13.0000 -117.8350 26.7000 -105.8580 36.4000 -121.5060 39.40...

etwa 4 Jahre vor | 0

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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...

etwa 4 Jahre vor | 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)))'

etwa 4 Jahre vor | 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...

etwa 4 Jahre vor | 0

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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...

etwa 4 Jahre vor | 0

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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);

etwa 4 Jahre vor | 0

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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...

etwa 4 Jahre vor | 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...

etwa 4 Jahre vor | 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 ...

etwa 4 Jahre vor | 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...

etwa 4 Jahre vor | 1

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