Question

Error using lsqcurvefit (line 262) Function value and YDATA sizes are not equal.

I am using the following code: %Import data as time and voltage: load VoltageData.mat; load('OCP_Cathode.mat'); %Load the O...

4 years ago | 1 answer | 0

Question

Finding the multiple zeros within a prescribed interval

I wish to solve the nonlinar function: =0 within a prescribed interval, say (0,100] say, I'm aware of usi...

4 years ago | 1 answer | 0

Question

Optimisation of parameters in a PDE

Hi, Suppose I am dealing with the heat equation: ∂T/∂t=α∂^2T/∂x^2 and I have some data which I want to fit it to and determ...

4 years ago | 1 answer | 0

Question

Solution diverges for 1D heat equation using Crank-Nicholson

I am trying to solve the 1D heat equation using the Crank-Nicholson method. I have managed to code up the method but my solution...

4 years ago | 1 answer | 0

Answered

System of PDEs which is tricky for PDEPE

I have some values which allow the code to run BUT I have oscillations in the diffusion which I should not get. I am assuming th...

System of PDEs which is tricky for PDEPE

I have some values which allow the code to run BUT I have oscillations in the diffusion which I should not get. I am assuming th...

5 years ago | 0

Answered

Variable density in heat diffusion equation

So I used the following code: function [CC, FF, SS]=battery_GE(x,t,u,DuDx) global rho; global c_th; global a_1;globa...

Variable density in heat diffusion equation

So I used the following code: function [CC, FF, SS]=battery_GE(x,t,u,DuDx) global rho; global c_th; global a_1;globa...

5 years ago | 0

Answered

Variable density in heat diffusion equation

So I do the interp1 trick you demonstrated before?

Variable density in heat diffusion equation

So I do the interp1 trick you demonstrated before?

5 years ago | 0

Question

Variable density in heat diffusion equation

Suppose I have a heat diffusion equation: rho(x)*c(x)*dT/dt=d/dx(k(x)*dT/dx) Where rho(x) is the density, c(x) is the heat...

5 years ago | 2 answers | 0

Question

Problems with pdepe and input variables

I have played around with my code and have the following code for pdepe which looks as if it should work: function battery_...

5 years ago | 0 answers | 0

Answered

System of PDEs which is tricky for PDEPE

So I managed a work around to get pdepe to work with my system and the code I'm using is: %This is the simplistic model of ...

System of PDEs which is tricky for PDEPE

So I managed a work around to get pdepe to work with my system and the code I'm using is: %This is the simplistic model of ...

5 years ago | 0

Question

System of PDEs which is tricky for PDEPE

I have a system of PDEs, mainly diffusion equations of the form: T_t-(k(x)(T_x)_x=a*E^2 c_t-(D(x)*c_x)_x=d*(E_x+c_x-T_x) ...

5 years ago | 5 answers | 0