MATLAB: Using greek letters as variables and as subscript in Matlab

greek lettersMATLAB

I want to write two things :

first B and puttings theta as letter not word as subscripts
second : using lambda or others as variables in the function or scriptsphip=phix+asind(cosd(lambda)*sin(D)/cosd(lambdap))

Best Answer

Sorry, the only characters that can be used in variable names or function names are:

must start with one of A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z, a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z
after that, each character must be one of A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z, a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or _ (underscore)
maximum of 63 characters in the identifier.

You might want to look at Live Script, which allows you to insert equations and formula as comments and which can be displayed as output.

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>> doc dlmwrite

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I think that you mainly need to realize that optimization toolbox generally asks that you put all of your control variables into one input argument, typically called x. See Writing Scalar Objective Functions. Also, since you have other data or variables that the solver is not supposed to change, include these extra parameters using the techniques of Passing Extra Parameters.

I suggest that you break up your variables into the x = control variables (the five-dimensional x variable that you want fmincon to change) and the extra parameters, and rewrite your functions in terms of x and the others explicitly. Something like

function f = myfun(x,extra)
a = x(1);
b = x(2);
c = x(3);
d = x(4);
e = x(5);
% put the rest of your computations here

Your subsidiary functions, the ones that help compute the objective, can have any inputs and outputs that you like, but for consistency they should use the same x as well as any other variables as inputs.

f is necessarily a scalar output of myfun.

Your nonlinear constraint function similarly needs to be in the correct syntax, such as

function [c,ceq] = nonlcon(x,extra)
c(1) = fun2(x,extra);
c(2) = fun3(x,extra); % Note: no cell arrays here
ceq = [];

Call the functions properly, such as

fun = @(x)myfun(x,extra)
nlc = @(x)nonlcon(x,extra);
[solution,fval] = fmincon(fun,x0,A,b,Aeq,beq,lb,ub,nlc,options)

Good luck,

Alan Weiss

MATLAB mathematical toolbox documentation

Best Answer

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