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**Feeds**

The mean function isn't working and i don't know why

Check whether the data type of Data_IV_KE is "double". To this end, MATLAB should return "double" when you type class(Data_IV...

9 hours ago | 0

Solving Second-Order BVP with unknown Constants using fsolve

solinit = bvpinit(linspace(-6.17415,6.17415,64),[0;0],[.809827,0]); sol = bvp4c(@mat4ode,@mat4bc, solinit); xint = linspace(...

12 hours ago | 0

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Hi,I tray RUN this code but i get tis error ( below the code)

Variables and/or functions are missing to run your code. According to the error message, m90_plot is an array of size 12784, bu...

1 day ago | 0

expressing the complex function

Use syms x t real instead of syms x t Then real(series) and imag(series) will work.

3 days ago | 0

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beginner integration trouble.

"int" cannot find an analytical antiderivative for f(x). Thus to get the numerical value for the integral, use Area=2*vpainte...

3 days ago | 0

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Using erfcinv and array indices are being rejected as not positive or valid, despite all being positive in the vector

As far as I understand, "erfbatp" is an array of numbers. So erfbatp(2*.05/2) = erfbatp(0.05) does not make sense, does it ? V...

4 days ago | 0

Converting symbolic ODE solution to function ... Warnings

The solution is implicitly given by the equation (a*y+b*y^2/2+c*y^3/3+d*y^4/4)-(a*y0+b*y0^2/2+c*y0^3/3+d*y0^4/4) - integral_{x'...

5 days ago | 0

convert the above expression into this graph

I'll show you how to solve for theta2 given theta from the equation sin(theta2-theta)+exp(-theta2/(omega*tau))*sin(theta)=0 F...

5 days ago | 1

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Trouble using ODE45 for coupled non-linear differential equation

I can't recover the four differential equations you solve from the two equations you included in mathematical form. Your equati...

5 days ago | 0

How to get the answer from the following code. How can i extract the values from the code?

F = U1.y(5,1)-Nt*U1.yp(5,1) J = -1i*U1.y(6,1) N1 = -U1.y(7,1) N2 = -U1.y(8,1)

6 days ago | 0

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Explicit method for Allen-Cahn equation

xstart = -1.0; xend = 1.0; nx = 401; x = linspace(xstart,xend,nx).'; dx = x(2)-x(1); tstart = 0.0; tend = 1.0; nt = 10; ...

6 days ago | 0

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How to fill a variable with the results of an if...elseif statement

Use imin = 0; imax = 0; isaddlePts = 0; iinconcl = 0; for ind = 1:9 D=fxx(Xc(ind),Yc(ind))*fyy(Xc(ind),Yc(ind)) - (fx...

7 days ago | 0

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Need to rectify error in my matlab code given below

I want to get a plot of dn/dt versus t. syms t mu=2500*(10^-4); %cm^2*V^-1 * s^-1 R = 0.318; eta=377;% ohm N=3.681; %refind...

7 days ago | 0

Using Runge Kutta to solve second-order differential equations with two degrees of freedom

I don't understand from your code if you want to perform a parameter study for 1000 different values of omega or if you want to ...

8 days ago | 0

Cannot get fmincon to work

clear close clc format long %% Variables dp = 11.6; taup = 3710e-6; dn = 2; taun = 371e-6; Jl = 50e-3; ni = 9.696e9; ...

8 days ago | 1

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I continue to get this error and can't figure out how to fix it, Unable to perform assignment because the size of the left side is 1-by-4 and the size of the right side is 1-b

If you take the derivative of a polynomial, the degree of the resulting polynomial is one less than the degree of the original p...

9 days ago | 0

coupled differntial equation using ode45

G = 1; Na = 1; xstart = -1; xend = 1; nx = 51; x = linspace(xstart,xend,nx); solinit = bvpinit(x, [0;0;1;0]); sol = bvp...

11 days ago | 1

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coupled differntial equation using ode45

syms y mu0 G Na U(y) T0(y) eqn1 = diff(mu0*diff(U,y)) == G; eqn2 = diff(T0,y,2) + Na*mu0*(diff(U,y))^2 == 0; conds1 = [U(-1)=...

11 days ago | 0

Using tabular data for Curve fitting of function z = f (x, y) with incomplete values of z. These blank z (i, j) automatically takes zero values and this is a problem

green = [5 5 5 5 5 4 4 4 4 1 1 1]; blue = [5 10 15 20 25 5 10 15 20 5 10 15]; yellow = [455 322 261 205 169 410 306 246 191 25...

12 days ago | 1

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Numerical method of the "fimplicit" function

Since you can specify a mesh density in x- and y- direction, my guess is that the function is simply evaluated on X x Y. Sign ch...

12 days ago | 0

My roots don't match example roots when solving routh criterion

syms K s p = s^3+9*s^2+12*s+15+3*K; solve(p,s,'MaxDegree',3) var2 = vpa(ans); var = subs(var2,K,-1)

13 days ago | 0

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Interrupt a while loop with functions if it takes too long

Is there a way of timing the iteration during its execution and break it? No. You could go into the function and time certain o...

14 days ago | 1

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How to solve the system of time dependent coupled PDE's?

ode23t seems to work for high Reynolds numbers. In case ode23t fails (e.g. for the low Reynolds number regime), I recommend the ...

15 days ago | 1

Problem with my gamma_water values not giving me the correct pressure using fsolve

Look at the curves and see what's happening. Your first equation has two solutions while your second has none: DelH = -1* (-917...

17 days ago | 0

Find zero of simple monotonic function where the independent variable can only be integer

If you know a lower integer value xl and an upper integer value xu with y(xl)*y(xu) < 0, you could do a binary search starting f...

17 days ago | 0

Model simulation Code for SEIR

seir_simulation() function seir_simulation() % Parameters beta = 0.3; % Effective contact rate without control sigma = 1/5; ...

17 days ago | 0

using loops and arrays to solve for variables in equations

You mean this ? x=zeros(5,1); vis=zeros(5,1); %strain rate epsUse=1e-14; Puse=1e9; PARAMS.R=8.314; %ideal gas constant %d...

17 days ago | 0

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How to use Matlab to find a pressure in a temperature and density spreadsheet using the nearest density value.

%Generate artificial data t = linspace(10,30, 25); p = linspace(1, 20, 20); [T,P] = ndgrid(t,p); d = exp(-((T-20).^2+(P-10)....

17 days ago | 0

Kolmogorov-Smirnov (KS) Test

From the documentation: h = kstest(x,Name,Value) returns a test decision for the one-sample Kolmogorov-Smirnov test with additi...

18 days ago | 0