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It always gives the error of "Empty sym: 0-by-1"
The result is correct: You have 26 equations of the form 1800 - c(i)*Fe = 0 for one variable Fe to be solved for, but 26 dif...

約3年前 | 0

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error: matrix dimensions must agree
K_a in your function definition is a scalar. Thus you have to change x0 to be a scalar, too. clc close all clear background...

約3年前 | 0

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What is the problem for the following matlab code for drawing contour plots of R0 against two parameters?
alpha= 1.0*0.0241; beta=0.001936 ; gamma=0.0020255; T=23.3; T0=23; mu_ref = 0.0017; mu1=0.039 ;mu2=0.002894; L=8; L0=8 ; delta...

約3年前 | 0

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fmincon is not working
You must define F = @(x) fun(x(1),x(2)) and pass "F" instead of "fun" to fminunc.

約3年前 | 0

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How to integrate a complicated function?
https://www.wolframalpha.com/input?i=integration&assumption=%7B%22C%22%2C+%22integration%22%7D+-%3E+%7B%22Calculator%22%7D&assum...

約3年前 | 0

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Function optimization with some conditions conditions
The dimensions would be correct if you use b = [b1;b2.';b3.']; instead of b = [b1;b2;b3]; but you'd better post the problem ...

約3年前 | 0

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How do you go about guessing for fitting parameter initializations?
This is a linear fitting problem for which you don't need initial guesses for the parameters: Data = [0.006 334 0.011 276 ...

約3年前 | 0

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How to solve a boundary value problem x"+x'=1, x(0)=1, x(1)=2 , with an impulse condition x(i/3+)=2*x(i/3)+1, x'(i/3+)=3*x'(i/3)-1;
syms t x1(t) x2(t) eqn1 = diff(x1,t,2) + diff(x1,t) == 1; Dx1 = diff(x1,t); eqn2 = diff(x2,t,2) + diff(x2,t) == 1; Dx2 = dif...

約3年前 | 0

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Error: In an assignment A(:) = B, the number of elements in A and B must be the same.
w(i)=w; This line of code makes no sense. You want to assign a vector w to a scalar w(i).

約3年前 | 0

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solving complex matrix with symbolic variables
syms a b c d e f g h k real z1=-30j; z2=0.08+0.40j; z3=-35j; z4=0.10+0.50j; z5=0.10+0.50j; z6=-25j; z7=0.30j; p1=a; p...

約3年前 | 0

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Kindly help me out with this code. its urgent please .thanks
The trigonometric functions sin, cos for an argument x are invoked as sin(x), cos(x),... If they have an exponent, they are eit...

約3年前 | 0

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How can I create a spline with conditions on the middle?
% Set up the problem with 16 conditions for 16 spline coefficients syms a [4,1] syms b [4,1] syms c [4,1] syms d [4,1] ...

約3年前 | 0

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Research of inflexion point - Index exceeds the number of array elements.
You forgot to initialize x as x = [] in the second example.

約3年前 | 0

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Fit a statistical distribution to truncated data
Why should it be justified to fit a dataset of a truncated normal by a normal distribution ? pd_fit_trunc = fitdist(data_trunc,...

約3年前 | 2

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Roots of an equation when two parameters are changed
"num" is a polynomial of degree 7 in M. Thus it has seven roots. But your code only gives one of these seven. So I hope you get ...

約3年前 | 0

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How can i find the roots of the complex equation?
You can get an analytical solution if you substitute y = z^2: syms y p = y^4 + (10548593400*y^3)/42679 + (33343133111071335000...

約3年前 | 0

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How to solve delay differential equations with computed history (not constant)
Save the results of the non-delayed ode in arrays T and Y, create an interpolation function fun_history = @(t) interp1(T,Y,t) ...

約3年前 | 0

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use of fminimax solver in matlab for optimization
z seems to be a constant in your objective function. Thus it doesn't influence the result of the optimization and doesn't need t...

約3年前 | 0

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Arrhenius model fitting using fminsearch
Your model function σ(T) = σ_ref * exp(-Ea/(kT)) does not have a maximum. Thus it is not suited to reflect your measurement data...

約3年前 | 0

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maximization with fmincon which of the two codes provided do the correct job
I suggest using a function instead of a function handle. I compared it with your implementation and random matrices for W and R...

約3年前 | 0

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Arrhenius model fitting using fminsearch
Imagine you get Ea = 3 and k = 6 in one run and Ea = 12 and k = 24 in a second run. Both solutions give the same quality of fitt...

約3年前 | 0

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Assign a value to a matrix element defined as a variable
prop = @(x)[[x(1)*ones(11,1);x(2)*ones(12,1)],[x(3)*ones(11,1);x(4)*ones(12,1)],zeros(23,1),zeros(23,1)]; prop([1 2 3 4])

約3年前 | 1

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can find regression and curve fit for given equation
Since your equation can be rearranged as dy/dx = 1/c * log((m-a)/b) your model assumes that dy/dx is equal to a constant that ...

約3年前 | 0

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lsqnonlin - error in finite differences, arrays of incompatible size
The size of your problem changes in the course of the computation from 685 to 650 functions to be minimized (see above). This wi...

約3年前 | 0

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How to turn off the simplification condition?
Then use expr = simplify(expr,'IgnoreAnalyticConstraints',true)

約3年前 | 1

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Least Squares with constraint on absolute value
rng("default") n = 32; y = rand(n,1) + 1i*rand(n,1); B = rand(n) + 1i*rand(n); x0 = rand(n,1) + 1i*rand(n,1); x0 = [real(x0...

約3年前 | 1

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Plotting the result of ODE that as a integral component.
For the first one substitute z(t) = integral_{tau=0}^{tau = t} y(tau) dtau and solve the system of differential equations y'...

約3年前 | 0

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How can I integrate the math equation (attachment) numerically?
Just as it's written: result = integral(@(Ex)Ex.*(NL(Ex)-NR(Ex)).*T(Ex),0,Inf) Of course, I don't know whether you defined the...

約3年前 | 0

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Plot the Diagram of the probability of some data
I don't know what exactly you mean by "Probability Diagram", but the usual way is to use histogram(data,'Normalization','pdf')

約3年前 | 0

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all function B = all(A < 0.5,3)
But why does this yield the same result? Because A has only 2 dimensions, not 3 or 4. Thus "all" operates on all elements separ...

約3年前 | 1