Answered
differentiation of function inside another function
Use the chain rule!

24 dagar ago | 0

Answered
how to make a for loop in an ODE 45
More like this I think: data = [0 86; 1 86; 2 117; 6 120; 7 130; 8 135; 13 169; 16 179; 23 224; ... 27 230; 29 242; 36 234...

25 dagar ago | 0

Answered
Solve system of equations with 4 + 2N equations
Not entirely clear to me what you want, but perhaps something like the following, where the edge equations are taken outside the...

25 dagar ago | 0

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Answered
Turning a function into anonymous function
What do you think is wrong with it? It works ok. Add plot(t,T_an2(t)),grid at the end to see the result.

25 dagar ago | 0

Answered
solving 13 interdependent odes simultaneously by ode45
Well, the following works. I wouldn't know if the results make sense! qgin=12; c_g_in=[1 2 3 4 5 6 ]; c=zeros(13,1); c_l_in...

26 dagar ago | 0

Answered
solving sets of two differential equations using Runge Kutta 4th order code
Here is the corrected version 1: % Solve y'(t)=-2y(t) with y0=3, 4th order Runge Kutta y10 = 3; % Initial Con...

26 dagar ago | 0

Answered
Fitting a sum of exponentials to data (Least squares)
Use Matlab's best-fit matrix approach as follows: t=[0.5 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0]; N=[5995 4930 3485 2550 191...

26 dagar ago | 0

Answered
Matlab solving a system of equations
Parameters, dx, Px, Tx, Mx and Vx can be evaluated simply as follows: a = 1.4; x = -0.5:0.1:0.5; b = 0.153 + x.^2; dx = ...

26 dagar ago | 0

Answered
Question on implementing Jacobi Method
More like this perhaps N=10; % 50; A=gallery('poisson',N); n=size(A,1); xs=ones(n,1); b=A*xs(:); MaxIter=10*n; TOL=1.e...

27 dagar ago | 0

Answered
Trouble plotting solution to two 2nd order ODEs using forward Euler method
The following sorts out your Euler integration: v0=85;%m/s angle=51*pi/180;%rad g=9.81;%m/s^2 m=0.145;%kg r=0.036;%m A=pi*...

28 dagar ago | 1

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Answered
Return the value of Matrix
mat_c(:,2)

29 dagar ago | 1

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Answered
vibration of a rod using spectral element method
I don't know if it solves your problem, but your last line should probably have ifft(u2f) not ifft(u2) on the right hand side.

29 dagar ago | 0

Answered
Not enough input arguments error in function
The following works for me (I['ve chosen random numbers for x as you didn't say what ones you used): x = rand(1,12); y = organ...

29 dagar ago | 0

Answered
How to merge tow rows in one row?
Like so A = [ 1 2 3 4 5 6 7 8 9 10 11 12]; B = [A(1,:) A(2,:)];

30 dagar ago | 0

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Matlab Numerical integral issue
Your problem occurs when the upper limit of the integration exceeds k0. Are you sure the functions are defined correctly for th...

30 dagar ago | 0

Answered
Why is an extra line being plotted?
More like this, I think: numFlr=2; Phi_EigVec=[1 3;2 -3;]; y1=zeros(numFlr,1); y2=zeros(numFlr,1); x1=zeros(numFlr,1); x...

ungefär en månad ago | 0

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Answered
Substitute the value of variable in an equation
Like this, for example: F = @(x,y,a) 3*x.^2*y+4*y.*x.^3+3*a*x; F1 = @(x,y,a) 4*x.*y.^2+3*y; x = 2; a = 3; y = 4; disp(F(...

ungefär en månad ago | 0

Answered
how can I interpolate functions
doc interp1

ungefär en månad ago | 0

Answered
not geting the plot and my loop is not working
Needs to be as follows: sigma=0.047193; V_tip=180; W=180; Cd_avg=0.01; R=2.235; Rv=80.529; ...

ungefär en månad ago | 0

Answered
function reshape creating matrix
"A" only has 11 elements. You want B to have 12 elements (3*4). If you set A = 10:21, for example, it will work.

ungefär en månad ago | 0

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Answered
tryin analyze a 3d truss
Your matrix "connectivity" has 12 rows, but only 2 columns, yet you are trying to access the third (4'th, 5'th ...12'th) column....

ungefär en månad ago | 0

Answered
Filling in values of a formula into another formula.
Your equation depends only on t, not x. The following is a modification of your code where I've removed the parameters that are...

ungefär en månad ago | 1

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Answered
ising model ploting problem
You have your plot commands within function "initSpins", which is never called by the coding above it! Also check line 49, wher...

ungefär en månad ago | 0

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Answered
Integral Not Calculating Numeric Result
Replace q = int(F,1,2) by q = int(F,1,2,'IgnoreAnalyticConstraints',true)

ungefär en månad ago | 0

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Answered
How to calculate a certain length of mean in a row of data points?
Use reshape to turn the 500000x1 vector into a 50000x10 matrix, then use mean and std on this.

ungefär en månad ago | 0

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Answered
Run and plot complex function
You probably meant to put parentheses in the following line: X=exp(1i*Omega)./exp(1i*Omega)-0.8; Did you mean: X=exp(1i*Omega...

ungefär en månad ago | 0

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Answered
How to control the outcome of an ODE?
How about just modifying dydt(5) within the function to % Temperature if y(5)>=600 dydt(5) = 0; else dydt(5) = ( (...

ungefär en månad ago | 0

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Answered
Error when solving differential equations
Your function has function dydt = vdpi1(t,y) but you really want dy returned, not dydt.

ungefär en månad ago | 0

Answered
not getting plot , why?
Arrange it like this sigma=0.047193; V_tip=180; W=180; Cd_avg=0.01; R=2.235; k=1.1; A=pi*R.^2; P_e= 61147.4; h=0:100:...

ungefär en månad ago | 0

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