Alan Stevens
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Contribute at least one answer each month for 12 consecutive months
Awarded to Alan Stevens on 02 May 2021
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Hi, is it possible to have variables in an ode45 that varies according to another function?
Put something like [T, p, rho, speedsound] = atmos(height); immediately after height = x(1); in function dynameqn. Not sur...
4 dagar ago | 0
root finding and plot of graph
Are you looking for something like this? hi = 1e-6; lo = 1e-9; n = 500; dt = (hi-lo)/n; t3 = lo:dt:hi; y = f(t3); subplo...
4 dagar ago | 0
Calculator result and MATLAB result are different
Have you checked that both are using degrees, or both radians? The Matlab as you've written it is using radians (use sind(24) a...
7 dagar ago | 1
How can I rotate a set of points by an angle around its origin?
Do you mean like this? ITM = [461400.0758 617474.3059 461400.8069 617475.4609 461400.8069 617475.4609 461402.3069 617477.633...
9 dagar ago | 1
| accepted
Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.
Try replacing x(4) = Velocities(3608.9,5249.3); by x(4,:) = Velocities(3608.9,5249.3); Same for x(5).
12 dagar ago | 0
Removing zeros from matrix
Like this? A = [1 2 3 4 5 6; 1 2 3 4 5 6; 1 2 3 4 5 0; 1 2 3 4 0 0; 1 2 3 0 0 0]; B = A'; B=B(:); B(B==0)=[]
ungefär en månad ago | 0
Error in ODE arguments
I suspect you mean like this (notice the way M divides, using the back-slash): % Numerical solution of IVP % M*xddot + C*x...
ungefär en månad ago | 2
| accepted
How to Approximate The Solution for an Initial Value Problem?
Try f = @(t,x) [x(2); sin(1.9*t)-4*x(1)]; [t,x] = ode45(f,[0,150],[1,0]); plot(t,x)
ungefär en månad ago | 1
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Creating a set range for a function
(x < 3) && (x > 25) An individual element of x can't be both less than 3 and greater than 25 at the same time. If here are ma...
ungefär en månad ago | 0
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Plotting the tangent line for newton raphson method
Like this? fx = @(x) x.^2 -2; dfdx = @(x) 2*x; n_step = 7 ; % Anzahl der durchzuführenden Schritte für Newtonverfahren...
ungefär en månad ago | 0
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Fit scatter plot with a curve
More like ths? x = [0.2337;0.296;0.3071;0.4208;0.2055;0.9597;0.8683;0.243;0.3363;0.2793;0.5292;0.2471;0.2282;0.4774;1.0392;0.43...
ungefär 2 månader ago | 1
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Generating random numbers with a different probabilities
Assuming there are just two levels of probability, and that the numbers are real, not just integers, you could try: p50 = 0.75;...
ungefär 2 månader ago | 1
Hi, what does ; exactly mean?
It means start a new row, e.g. x = [1 2; 3 4]; disp(x)
ungefär 2 månader ago | 0
Solve the IVP y′′′=sin(y2)+y′+cos(t), provided with an appropriate set of initial conditions of your choice, and using Matlab's ODE45 function.
Like this? (Note the IC for d^2y/dt^2 must be consistent with the values chosen for y(0) and dy(0)/dt). Change the IC's and tim...
ungefär 2 månader ago | 0
Need Help Solving System of ODEs
You haven't included the first term on the right-hand side of your equation for dV/dt, nor for dgamma/dt.
ungefär 2 månader ago | 1
spring mass using ode45
Like this x0 = [0; 0]; tspan = [0, 10]; [t, x] = ode45(@func, tspan, x0); subplot(2,1,1) plot(t, x(:, 1)); grid('on...
ungefär 2 månader ago | 0
I am getting error in this program. Please suggest the corrections.
Change c = [1 2 2 3 4 5 6 7]; to c = [1 2 3 4 5 6 7];
2 månader ago | 1
Hello, I'm trying to plot one non-piecewise function and two piecewise functions in one graph but I keep getting an error. I don't understand the two error messages below.
You need to put the non-local functions at the end, as in the following. There were several other errors. I don't know if my co...
2 månader ago | 0
How to Solve equation using Eulers method in Matlab?
Here's part (a) for you - definitely not a straight line!
2 månader ago | 0
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I need to set up a Runge Kutta solver for water leaving a bucket through a certain diameter nozzle as function of time, it says array indices must be positive integers/log val
Indices in Matlab start at 1, not 0, so you need for i=1:60:200 not for i=0:60:200
2 månader ago | 0
How to get one output for each input into an equation in MATLAB?
mu = mu_max * (x./(x+Ks)); % Notice it is ./ not just /
2 månader ago | 0
How to solve 'Index number exceeds number of array elements(1)'
You don't update XSOL, so when ct is 2, XSOL(ct) doesn't exist.
2 månader ago | 0
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A question about FitzHugh-Nagumo model
Like this? tspan = [0 100]; v0 = 0; w0 = 0; IC = [v0 w0]; A=0.5; B=0.05; Epsilon=0.005; I=@(t)sin(t); %%%%%%%%%%%%%%...
2 månader ago | 0
| accepted
How to find parameters that minimize a difference
Use fminsearch and use the norm of the differences. help fminsearch
2 månader ago | 2
I want to combine 2 variables in matlab into one variable
If they are imported as, say, c1 and c2, then you can simply write c = [c1; c2]; then delete the c1 and c2 if you don't need t...
2 månader ago | 0
| accepted
How can i call an equation and it's derivative inside a matlab function?
Like this, perhaps: % TC is given in terms of percentage! x0=0; TC=10^-4; error=TC+1; i=0; x(1)=x0; while(error>TC) [f...
2 månader ago | 0
simple Fixed Point Iteration
Probably more like this (though you don't seem to have used function f anywhere): n = 11; x = zeros(1,numel(n)); ea = zeros(1...
2 månader ago | 0
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I want Estimate log to the base 10 value using 'x' number such that 10^estimated value is equal to or just exceeding x.
< not <= a = log10_bywhile( 50, 0.1 ) b = log10_bywhile( 100, 1 ) function [out] = log10_bywhile(x, inc) esmt = 0; % if...
2 månader ago | 0
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How can I change the value of Y in the columns whare the value of X is zero in matrix ?
Like this XY = [1 5 0 10 3 26 0 5]; XY(XY(:,1)==0,2) = 1.5
2 månader ago | 1
| accepted
