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How do I need to configure Matlab's solver such that it returns the correct solutions when complex magnitudes are involved?
Better use solve(expression*expression'==1,w) instead of solve(abs(expression)==1,w) From your hand calculation it follows t...

3年弱前 | 0

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linsolve for coefficient matrix
A.'*X.' = B.'

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system of non linear equations
%solving stsyem of nonlinear equation 3.31 and 3.32 Woods paper with fsolve % eta_l= x1 , eta_u= x2 r=2; v=20; F=13/9; fu...

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not enough input arguments help in line 6 please explain why.
Works (see above). The list of input arguments to your function in the call to ode45 was wrong. [v,x] = ode45(@(v,x)ch6(t,x),v...

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The return value of the objective callback function must be a real double scalar.
Looking at your objective function, it seems it it returns complex values. This will make MATLAB error - you cannot minimize a f...

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Solving a system of 6 DAEs of first order - index error
The reason why it doesn't work is that you don't have an equation that directly solves for y. Equation (1) solves for w, equati...

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Please help me with this qustion
syms v1 vo = 4/10 + v1 eqn1 = v1/10 + (v1-60/20) + v1-5*vo/20 ==0 v1_sol=solve(eqn1, v1) vo_sol = subs(vo,v1,v1_sol)

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odextend initial guess error
Compute the solution up to t1 using ode15s. Make a loop over the different F(t)'s you want to prescribe and restart all the con...

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How can I correct this error "Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters"?
Maybe [t,y] = ode45(@equfunc,[0 200],1); plot(t,y) Look at the examples provided in the documentation of ode45: https://uk....

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Can't solve the equations
You must tell us which solution you want. syms pb pg sb = 1; ds=0.25; dm=0.2; k=1; sg=1; m=0.01; r=0.06; f=0.075; ms=0...

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For some reason, I am not getting plots when I put in this code for this question.
if Delta > 0 % Case of real and distinct roots x1 = (-b + sqrt(Delta)) / (2*a); x2 = (-b - sqrt(Delta)) / (2*a)...

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I get an error despite that the variable xddot is in the scope of the Nested function
To compute Fxfr in the line f1 = a*(Fyfr + Fyfl) - b*(Fyrr + Fyrl) + Bf/2*(Fxfl - Fxfr) + Br/2*(Fxrl - Fxrr); you need x...

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correct the following code for unsteady maxwell nanofluids
dydx has to consist of 6 equations: dydx(1) = y(2), dydx(2) = y(3), dydx(3) = f''' dydx(4) = y(5), dydx(5) = g'' dydx(6) = h'...

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Numerical differentiation in time in function used by ODE
ode15s can solve systems of differential equations of the form M*y' = f(t,y) where M is the so called mass matrix. If a row j of...

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Finding Solution to Inequality in Matlab
I don't understand the result, but there is some output from the symbolic toolbox. As you can see, the numerator of sol.x is a ...

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Nonlinear equation solver for neoclassical growth model
Set the right-hand sides of the resource constraint and the production constraint equal and solve for i(t). You will get an equa...

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Error: Incorrect dimensions for matrix multiplication
You set uold = unew, but unew is 30x1 instead of 29x1. Since D(2:N,2:N) is 29x29, MATLAB errors in the next iteration when you ...

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Incorrect Dimensions for matrix multiplication
You multiply and divide arrays elementwise when you compute Rtf. Thus you have to use elementwise multiplication (.*) and elemen...

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How to use pdist2 command for distance calculation?
If you implement your own distance function for the haversine distance, you can use pdist2.

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Empty sym: 0-by-1
Use A = double(arrayfun(@(i)solve(GI(i),V),1:numel(P))) instead of A = solve(GI,V)

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How to use a constraint on the output of a goal function?
You must ask yourself: How could the objective function become complex-valued ? Maybe you have a log(x) expression in it and the...

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Objective function is returning Inf or NaN values at initial point. lsqcurvefit cannot continue.
Before you call lsqcurvefit, you should call your function "func" with the initial guess values for the parameters to see what i...

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NaN Error , while solving Newton Raphson method
@MAYUR MARUTI DHIRDE for i = 2:Nx - 1 J(i, i - 1) = -1 / (2 * dx); J(i, i + 1) = 1 / (2 * dx); end Your loop starts...

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Is it possible to solve this differential equation by modifying a given algorithm?
Seems your function to be integrated has a singularity between d/2 and R. Applying "integral" in this case is almost impossible....

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Assisted Simplification with other equations?
I was told that using the below information that I can simplify eqn to be truely a function of gamma alone Since Q does not app...

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Shifting an array to create a time delay within a function.
Use dde23 instead of ode23t.

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Is there a possibility to solve this equation numerically using MATLAB?
Please include the code you are using at the moment and critical values for u'(0). Is there any equation for u without the inte...

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Problem fitting the curve with fminsearch
Using a polynomial of degree 5 to fit your data is a bad idea because the higher the degree, the greater the oscillations betwee...

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Solve a matrix that has nonlinear coefficients
If the coefficients contain the unknowns, a matrix representation of your system of equations leads you nowhere. Write your sys...

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How can I solve this PDE kinetics equation with Symbolic Toolbox?
PDEs cannot be solved with the symbolic toolbox. Use "pdepe" as numerical solver instead.

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