Respondida
I have these 3 columns and I want to divide p/z and put the p/z values in a new columns
p=[2080,1885,1620,1205,888,645]; z=[0.759,0.767,0.787,0.828,0.866,0.900]; gp=[0,6.873,14.002,23.687,31.009,36.207]; new_row =...

más de 3 años hace | 0

Respondida
How to obtained matris vector solution using fminunc function?
You will have to use fminunc three times: c_1=[3;5;8]; c_2=[2;6;8]; x1_sol = zeros(size(c_1)); x2_sol = zeros(size(c_1)); f...

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Applying updated initial conditions at every points of tspan and solve system of ODE using ode45
Then why do you solve for v1 if you want to prescribe it ? Simply set v1 = u0x + vp*p1 in your code and determine displacement...

más de 3 años hace | 0

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Using lsqnonlin for deconvolution
lsqnonlin tries to adjust x, and you reset it to 0: function F=insulin(x) ... x=zeros(89,1); This destroys the complete fitt...

más de 3 años hace | 1

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The following error was reported evaluating the function in FunctionLine update: Unable to convert expression into double array.
Your calculations partially produce complex and NaN values. And you cannot prevent this by trying to force them to be real. pv1...

más de 3 años hace | 0

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Solve of implicity equations
You should first check whether a zero of your function really exists. It doesn't seem to be the case: alpha = 0.14; A = 3300; n...

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why do I get this error in the simulation
Before calling "interp1", use % Sort array oxygen_energy_tot in ascending order [oxygen_energy_tot_sorted,idx_sort] = sort(oxy...

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ode45 with a array of vector
a1 = ...; a2 = ...; a3 = ...; b1 = ...; b2 = ...; b3 = ...; c1 = ...; c2 = ...; c3 = ...; vp = ...; tValues = linspace...

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function handle array Problem
result = integral(@fun,0,1000,'ArrayValued',1) function value = fun(a) m = [1,2]; U(3) = a + 2; V(3) = a - 2; for...

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i want to solve a set of homogeneous linear equation
Or use the following code to produce an optimal solution in the least-squares sense: A =1.0e+04*[6.6064,-3.5642,0,0;-3.5642,6.6...

más de 3 años hace | 0

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is there any way to get a 2nd order polynominal through 2 points(each end point)
rng("default") syms a b c x y n = 30; % number of data points xdata = sym('xdata',[1 n]); % x values ydata = sym('ydat...

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Respondida
Error using plot Vectors must be the same length
As you can see above, S and f have a different number of elements. So they cannot be plotted against each other.

más de 3 años hace | 1

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incorrect dimensions for matrix multiplication in piecewise function in matlab
tau = 1.0; V_D = 0.72; vi = @(t) sin(2*pi*t); f = @(t) max(vi(t)-V_D,0).*exp(-t/tau); t = 0:0.01:2*pi; plot(t,f(t))

más de 3 años hace | 0

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How do I store an ODE in a vector?
Either you use the code below and work with the time derivatives after the integration to decide when the curves have flattened ...

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How to implement the Gaussian radial basis function in MATLAB ?
Before you start the optimization, check whether K in your case is positive-definite. Lt = 10; p = rand(Lt,4); sigma = 1.0; ...

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Interface boundary condition in transient heat problem
Here is a sample code for what I wrote above: % Set parameters x1start = 0.0; x1end = 0.25; x2start = x1end; x2en...

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How to solve below PDE based model using finite difference scheme.
Take a grid (ai,xj) over your rectangular region with 0 = a1 < a2 < ... < an = 60 0 = x1 < x2 < ... < xm = 40 Approximate the...

más de 3 años hace | 2

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Error: Array indices must be positive integers or logical values. implementing fletcher reeves method
[xmin,valormin]=fletcherreeves2([5;5],@(x) x(1)^2-x(1)*x(2)+4*x(2)^2+3*x(1)+2,@(x) [2*x(1)-x(2)+3;-x(1)+8*x(2)],10^-(6)) func...

más de 3 años hace | 0

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Why do I get 'Array indices must be positive or logical values' in symsum function?
h=0.05; U=0.02; delta_t=1; v=1.846*10^-5; d=1.117; t=50; y=0.2; P=pi; n = 1:300; Fn = 1./n.*exp(-(n.^2*P^2*v*t)/(d*h^2)...

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How to get numerical values of nonlinear implicit function?
k = -1.5; F = @(t,y) log(abs(y)) - y.^2/2 - t - k; fimplicit(F,[0,4],'*') t = 0:0.01:0.99; y0 = 2.0; y = zeros(size(t)); f...

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How to write the equation in matlab I= A A* T² exp (qob/kT) exp (q(V - Rs I /kT)) (exp (-1/n) ? Why is the curve not shown in the drawing?
Maybe you mean I = A*a*T^2*exp(q*phi_b/(K*T))*exp(q*(V-I1*Rs/(K*T)))*exp(-1/n) ?

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How to solve three coupled partial differential equations using matlab code?
Use MATLAB's "pdepe".

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Solving economic dispatch problem
The message from "quadprog" says that no feasible solution can be found. So you will have to reconsider your constraints - it se...

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it says it cant plot because my vectors aren't the same size but they are
Check whether size(yvar) equals size(xvar). I think this cannot be true because the following code works: yvec=[6.67 17.33 42...

más de 3 años hace | 0

Respondida
I'm trying to run a code to plot conversion vs catalyst mass in a packed bed reactor, but something is wrong.
You tell the integrator that you have four additional inputs to your function [W,F]=ode45(@(t,F)ODEfun(t,F,T,P_total,F0_total,R...

más de 3 años hace | 0

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Bisection function to determine the value of (k) not working.
Please fill in the missing values and try again. If you don't succeed, it usually helps to plot f in the range 1e-12:1-1e-12 fo...

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2nd Order ODE Euler method not producing expected results
Not that bad. %Coefficients m1=3; m2=6; k1=1; k2=9; k3=3; c1=0.02; c2=0.09; c3=0.06; % Step sizes h=0.00005; t...

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Index exceeds the number of array elements (7).
The last two loops also have to run from 1 to length(code), not from 1 to length(t).

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Summing over indices using symsum
u=symunit; Q(1)=10E-9*(u.C); Q(2)=15E-9*(u.C); Q(3)=7E-9*(u.C); Qsum = sum(Q)

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Fitting method with multiple response variables (y1, y2, y3).
rng("default") X = linspace(0, 10, 100)'; Y1 = 2*X.^2 - 3*X + randn(size(X))*0.5; Y2 = 2.5*X.^2 - 3*X + randn(size(X))*0.5; ...

más de 3 años hace | 0