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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 ...

8 years 前 | 1

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已回答
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...

8 years 前 | 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,...

8 years 前 | 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...

8 years 前 | 3

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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 ...

9 years 前 | 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(...

9 years 前 | 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)

9 years 前 | 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...

9 years 前 | 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...

9 years 前 | 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...

9 years 前 | 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...

9 years 前 | 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...

9 years 前 | 0

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已回答
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

9 years 前 | 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(...

9 years 前 | 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]

9 years 前 | 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...

9 years 前 | 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...

9 years 前 | 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...

9 years 前 | 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...

9 years 前 | 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,... ...

9 years 前 | 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).*...

9 years 前 | 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...

9 years 前 | 0

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

9 years 前 | 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 ...

9 years 前 | 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)

9 years 前 | 0

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已回答
How to do better commenting in Matlab script?
Tanmoy, (in R2015a) go to Preferences > Editor/Debugger > Display. In the Right-hand text limit section you can remove that line...

9 years 前 | 0

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How can I use for loop twice
Hi Omkar, looks like the second |end| is misplaced. Als, I recommend using |ii| instead of |i| (and same for |j|) because it is ...

9 years 前 | 0

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Symbolic derivative of function using diff()
Check out the <http://www.mathworks.com/matlabcentral/fileexchange/49796-euler-lagrange-tool-package Euler-Lagrange> tool on Fil...

9 years 前 | 0

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Is it possible to plot lines with different colors using single plot command or some other way?
Muhammad, you could do something like: vertex = ['a','b','c','d','e','f']; ang = [0:pi/3:2*pi]; x = cos(ang); ...

9 years 前 | 0

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create time-changing graphic contour map
Samuel, use something like [X,Y,Z] = peaks(50); figure h = surf(X,Y,Z); axis manual for ii = 0:2...

9 years 前 | 0