MATLAB: Am getting the error ‘ Array indices must be positive integers or logical values.

MATLAB

Find the following code below

kiki = 2;
xander = 1/n * h1 (sum(kiki * (([m{:}] - numel(Test)/h1))));

I am getting the following error

Array indices must be positive integers or logical values.

Kindly help

Thanks in advance

Tino

Best Answer

xander = 1/n * h1 * (sum(kiki * (([m{:}] - numel(Test)/h1))));
%                 ^ missed

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MATLAB: Assign value to an array

The index must be positive integer or logical

Your are allowed to use

x(1),x(2),...

%or

x(logical(0)) and x(logical(1))

look at

http://www.mathworks.com/company/newsletters/articles/Matrix-Indexing-in-MATLAB/matrix.html

MATLAB: Solve system of 2nd order differential equations with initial conditions

syms phi1(t) phi2(t) 
g = 9.8;
m = 1;
k = 1;
c = 1;
l = 1;
l0 = 0.75;
dphi1=diff(phi1,t);
dphi2=diff(phi2,t);
eq1 =  -(m * g * l * sind(phi1) + k * (l0^2) * cosd(phi1) * (sind(phi1) - sind(phi2)) + c * (l0^2) * cos(phi1) * (cos(phi1) * dphi1 - cosd(phi2) * dphi2))/(m * (l^2)) == diff(phi1, t ,2);
eq2 =  -(m * g * l * sind(phi2) - k * (l0^2) * cosd(phi2) * (sind(phi1) - sind(phi2)) - c * (l0^2) * cos(phi2) * (cos(phi1) * dphi1 - cosd(phi2) * dphi2))/(m * (l^2)) == diff(phi2, t ,2);
vars = [phi1(t) ; phi2(t)]
V = odeToVectorField([eq1,eq2])
M = matlabFunction(V,'vars', {'t','Y'})
interval = [0 1.5];  %time interval
y0 = [8 0 -4 0];      %initial conditions
ySol = ode45(M,interval,y0);
tValues = linspace(interval(1),interval(2),1000);
yValues = deval(ySol,tValues,1); %number 1 denotes first solution likewise you can mention 2 , 3 & 4 for the next three solutions
plot(tValues,yValues)

Best Answer

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MATLAB: Assign value to an array

MATLAB: Solve system of 2nd order differential equations with initial conditions

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