Respondida
solving differential equation for diffrent intial condition
Samee, check out this <https://www.mathworks.com/matlabcentral/answers/118837-how-to-add-trajectory-into-a-phase-plane#answer_12...

casi 10 años hace | 0

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flight simulation using 3d animation
Ahmed, based on your screen shot it looks like you have not assigned unique names to the objects in your VR. As an example, one ...

casi 10 años hace | 0

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Using ODE, several errors with a spring system and function
Julia, use function myODE() e = 0.0:.2:1.0; % no brackets, the colons are used to define the vector t = [1 20];...

casi 10 años hace | 0

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ode45 with a function that change with time
Nashira, one approach is to use two different ode functions. Use the first one to integrate over the time interval |[0,tp]| and ...

casi 10 años hace | 0

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ode45 is not outputting solutions for each increment specified by my “time-span” vector
zek3r, use [tsol,ysol] % returns vectors/matrices instead of [outputs] % returns structure as the output ar...

casi 10 años hace | 0

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Solve the chain rule in lagrange equation
Siti, the Euler-Lagrange tool package on <http://www.mathworks.com/matlabcentral/fileexchange/49796-euler-lagrange-tool-package ...

alrededor de 10 años hace | 1

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How to plot the trajectories of the equilibrium points
Raja, you are probably best off to solving differential equations of the system for different initial conditions (and the plot t...

alrededor de 10 años hace | 0

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How do I fix the "index exceeds matrix dimensions error?
Cassidy, it is the placement of the state vector in the function call to |ode45| and the function [t,X] = ode45(@DE,t,...

alrededor de 10 años hace | 0

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How can I solve symbolic Lagrange equations of motion numerically?
Hi Alexander, check out the <http://www.mathworks.com/matlabcentral/fileexchange/49796-euler-lagrange-tool-package Euler-Lagrang...

alrededor de 10 años hace | 3

Respondida
Removing the string from cell array
Gopalakrishnan, use e.g. |strrep| a = {'fdf_faf' ; 'dfaf_dfa' ; 'dfadf_dfaf'; 'dfaf_fdaf';'daf_dfaf';'dfaf_fff'}; arep ...

casi 11 años hace | 1

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Select specific coefficient from symbolic polynomial
Farid, you can back out the subexpressions and the corresponding coefficients of the polynomial using |coeffs| syms x y z P(...

casi 11 años hace | 0

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How can I tell if the parallel computing toolbox installed?
J, use the |ver| command. You should see something like Parallel Computing Toolbox Version 6.6 (R2015a)

casi 11 años hace | 3

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can be 2 different figures can be plotted and seen ?
Sure. E.g. figure plot(x,y) figure plot(n,p) Alternatively, use |subplot| subplot(2,1,1) plot(x,y) subplo...

casi 11 años hace | 0

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plot for different values
Lincy, you mean probably something like x = 4:4:20; p = [0.3; 0.4; 0.8]; y = bsxfun(@rdivide, x, p); plot(x,y) Give...

casi 11 años hace | 0

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why does the year function not work as specified in documentation?
Edmund, you probably do not have access to the <http://www.mathworks.com/help/finance/functionlist.html Financial Toolbox>. Chec...

casi 11 años hace | 0

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vpasolve does not handle inequalities correctly
Jesse, according to the documentation " |vpasolve| ignores assumptions set on variables. You can restrict the returned result...

casi 11 años hace | 0

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Nested if statement not perusing all if statements
Justin, almost there... for i = 1:100 if matrixA(i,2) < 0 matrixB(i,1) = i/a*i elseif matrixA(i,1...

casi 11 años hace | 0

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keeping track of the original indices of an array after sorting
Md, simply use [B,I] = sort(A,'ascend') B = 1 2 3 4 5 I = 3 4 5 2 1

casi 11 años hace | 22

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how to solve equations ?
Symbolically, syms x solve(sin(x) - 0.5 == 0,x) ans = pi/6 (5*pi)/6 Numerically, myfun = @(x) sin(...

casi 11 años hace | 1

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Selecting non-zero elements from a symbolic vector
Farid, you could use syms a b c d = [a*b, 0 , a^2*b*c, 1, 0]; d(d==0) = [] d = [ a*b, a^2*b*c, 1]

casi 11 años hace | 0

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Sym and Syms matlab 2014b MAC doesn't exist
Pedro, you probably do not have access to the Symbolic Math Toolbox. Check out this <http://www.mathworks.com/matlabcentral/answ...

casi 11 años hace | 0

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Changing file name in Matlab
Tanmoyee, use the |strrep| command str = 'wflux_23.25_86.75'; str_new = strrep(str, 'wflux', 'data') str_new = dat...

casi 11 años hace | 0

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Error with FOR loop and SQRT: In an assignment A(I) = B, the number of elements in B and I must be the same.
Michael, in for i=1:N c(i)=c*sqrt(1-(y(i)/(b/2))^2) end |c| is a vector of varying size (growing), which you a...

casi 11 años hace | 0

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I want to loop by giving the C stops at a value less than 0.0001.
Angkhana, almost there. A = input('Enter A: '); B = input('Enter B: '); func = @(x) exp(x)-2*cos(x); err = 1e-4...

casi 11 años hace | 1

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How can i solve this using MATLAB ?
Bello, if you have access to the Symbolic Math Toolbox: syms F1 F2 F3 sol = solve([2==0.04*F1+0.54*F2+0.26*F3,... ...

casi 11 años hace | 0

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How to plot these function plesa help
Joe, you could use [x1,x2] = meshgrid(0:0.5:10,0:0.5:10); f = (4 - 2.1*x1.^2 + x1.^4/3).*x1.^2 + x1.*x2 + (-4 + 4*x2.^2).*...

casi 11 años hace | 0

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correction for loop in bisection method
Anupan, check out A = input('Enter A: '); B = input('Enter B: '); func = @(x) exp(x)-2*cos(x); % use instead anonym...

casi 11 años hace | 0

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How to write correct matlab codes in solving equation?
Anupan, use syms x solve(x+2 == 1,x)

casi 11 años hace | 0

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How to merge two D arrays according a given order?
Aditya, how about ID1 = [id1' id1_coords]; ID2 = [id2' id2_coords]; ID = sortrows([ID1; ID2]) ID = 1 26 ...

casi 11 años hace | 1

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Trying to plot radioactive decay equation
Daniel, you can simply do lambda = log10(2)/5700; x = 1:100; y = (-1/lambda)*log10(x/100); plot(x,y)

casi 11 años hace | 0

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