Answered
Spatio-temporal plug flow reactor simulation with method of lines
function PFR_t_L_sim_v2_1 % function method_of_lines clear all; clc; close all function dCdt = reaction(t,C) C1 ...

4 years ago | 1

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Answered
Maximum Likelihood Estimation function
x = your data vector fun = @(a) n/a + sum(x) - 2*a*sum(exp(a*x)./(exp(a*x)+1); a = fzero(fun,1)

4 years ago | 0

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Answered
Hello, the code to enter and raise the integral does not run, what is wrongly written?
a=0.286; b=0.1851; c=1.272; f=@(t)t.^(0.5*c).*exp(-0.5*a*t); I = sqrt(b)*integral(f,0,Inf)

4 years ago | 0

Answered
Solve system of equations without Symbolic Math Toolbox for Compiler
Did you try "solve" on your system of equations with the numerical vlist coeffcients replaced also by symbolic variables ? syms...

4 years ago | 1

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Answered
Error fit: Complex value computed by model function
Fit under the constraint b^2-a^2 >= 0

4 years ago | 0

Answered
pde mass transfer with reaction
clc;clear all;close all; L = 1; x = linspace(0,L,50); t = linspace(0,1,50); % t = [linspace(0,0.05,20), linspace(0.5,5,10)];...

4 years ago | 0

Answered
Crank-Nicolson scheme for system of differential equations
y0(1,1) = 0.2; y0(2,1) = 0; x = 0:0.125:100; h = x(2)-x(1); y = zeros(2,numel(x)); y(:,1) = y0; for i4 =...

4 years ago | 0

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Answered
Need help plotting this
n = 36; T=20*10^-3; t=0:T/1000:T; w=2*pi*1/T; %f=i(t) f=@(t)0+100.*(t>1*T/12).*(t<5*T/12)-100.*(t>7*T/12).*(t<11*T/12); a0...

4 years ago | 1

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Answered
Help in looping and iterating constant values in differential equation which is being solved my numerical method.
Define all time-dependent parameters as function handles and apply these handles in your function definition. As an example for...

4 years ago | 0

Answered
Using Implicit Euler Method with Newton-Raphson method
f = @(t,y) -20*t*y^2; f_y = @(t,y) -40*t*y; t0 = 0; T = 1; y0 = 1; h = 0.01; tol = 1e-8; N = 100; y = imp_euler(f,f_y,t0...

4 years ago | 1

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Answered
How do I create a loop for this calculation in MATLAB?
%constants c = 1.1e-10; m = 3.3; p500 = [ -0.3142 2.3172 -7.0249 11.2867]; p2000 = [ -1.2577 9.2728 -28.1056 45...

4 years ago | 0

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Answered
Error using fzero function
I changed v = -4*hp.*A(h)./pi*d^2; %vitesse dans le tuyau to v = -4*hp.*A(h)./(pi*d^2); %vitesse dans le tuyau For bett...

4 years ago | 0

Answered
Hi guys this question is on linear programming and i am trying to figure out how to define inequalities with unknown variables.
help linprog and https://de.mathworks.com/matlabcentral/fileexchange/24816-plot_feasible-m

4 years ago | 0

Answered
Optimal control problem with integral cost function and both initial and terminal conditions
I think this part % convert symbolic objects to strings for using ’dsolve’ eq1 = strcat('Dx1=',char(Dx1)); %concatena le strin...

4 years ago | 0

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Answered
Find row with unequal distance
idx = find(diff(diff(A)) > 0,1,'first'); A(idx+2)

4 years ago | 0

Answered
Looking for method to simplify equation within MATLAB
syms a b c d X = 2*a+3*b+7*c+d; X = subs(X,d,2*a+4*b)

4 years ago | 0

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Answered
ı want to solve this question by excel formulas?
Without guarantee: disbursement = (5000*1.04^23 + 2000*1.04^4*(1.04^19-1)/0.04)/((1.04^4-1)/0.04) thus approximately 18150 $.

4 years ago | 1

Answered
Choosing balls from the boxes
positions_red = 1:4; positions_blue = 5:8; positions_green = 9:12; position_black = 13; Ntrials = 1e5; succ...

4 years ago | 1

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Answered
Find zero crossings in each row of a matrix (321 x 123 double)
https://de.mathworks.com/matlabcentral/answers/375849-finding-zero-crossings-in-a-signal

4 years ago | 0

Answered
How to plot this equation?
fun = @(t,y) 2*y./t - t.^2.*y.^2; t = 0.1:0.1:3; y = 0:0.1:3; [T,Y] = meshgrid(t,y); surf(T,Y,fun(T,Y))

4 years ago | 0

Answered
after generating a 4 by 4 random matrix of X on matlab. How do i change X so that all its elements are in the range of 10 to 50
X = 10 + rand(4,4)*(50-10)

4 years ago | 0

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Answered
How to plot this equation if C is 4?
fun = @(t,C) 5*t.^2./(t.^5+C); t = 0:0.01:3; C = 4; plot(t,fun(t,C))

4 years ago | 0

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Answered
optimization of delayed differential equations (dde)
Make the best of it. pTrue = [1 1 1 1 1 1 1 1 1]; time = 0:7; Y = ...; Am1=[1,1.1,1.4,0.7,0.8,1.6,2,1.5]; Bm1=[1.5,1.0,0....

4 years ago | 0

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Answered
Unable to perform assignment because the size of the left side is 1-by-1 and the size of the right side is 1-by-2000.
Setting b01(t) = b01 + gamma(t); b02(t) = b02 + gamma(t); b = b01 + b02; makes b01, b02 and b to arrays of size 1x2000 sinc...

4 years ago | 0

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Answered
Hello everyone I'm new, can some help me little bit with my problem. I need to sum free Fourier together.
x = 0:100; F1 = feval(f1,x); F2 = feval(f2,x); F3 = feval(f3,x); SS = F1 + F2 + F3; plot(x,SS) coefficientValues1 = coef...

4 years ago | 0

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Answered
Newton Raphson for Backwards Euler on System of differential equations
y0(1,1) = 0; y0(2,1) = 1; x = 0:0.01:2*pi; h = x(2)-x(1); y = zeros(2,numel(x)); y(:,1) = y0; for i4 = 1:...

4 years ago | 0

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Answered
How to solve system of trigonometric equations?
Since you have a nonlinear system of equations, you must use a nonlinear solver and not a linear solver as you did: F = @(x,y,z...

4 years ago | 0

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Answered
Solving a polynomial function using the solve function is not working
eqn = x^3 - 2*x^2 - 5*x + 6 == 0; solve(eqn,'MaxDegree',3)

4 years ago | 0

Answered
What are some Taylor series commands?
https://de.mathworks.com/help/symbolic/sym.taylor.html

4 years ago | 0

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Answered
New to MatLab: How to enter given data for a random variable (&find /fit distribution function)
n = 30; sample = random(n) function sample = random(n) uniform = rand(n,1); sample = zeros(size(uniform)); for i = ...

4 years ago | 0