如何为生成的函数排序输入参数

Question

如何更改输入参数的顺序？对于 fncA_approx()，输入参数是有序的 (height, t)，这实际上是违反直觉的。如何控制 matlabFunction 输出的输入参数顺序以便输入参数排列 (t, height)?

%% 1.10 Torricelli's equation_; %'//


syms Qua t Area height alf

% (a)
%delta_Height = dsolve('Dheight = (3*Qua*((sin(t))^2) - (alf*( 1+ height)^1.5))/Area', 'height(0) = 0')
% (b)
dHeight_dt = (3*Qua*(sin(t))^2 - alf*( 1+ height)^1.5)/Area
fnca_approx = subs(dHeight_dt, {Area, Qua, alf}, {1250, 450, 150})
fncA_approx = matlabFunction(fnca_approx)
%%
step = 0.5;
t = 0:step:10; 
height = ones(size(t)); 
k = 1; 
height(1) = 0; 
 while k < length(t)
 height(k + 1) = height(k) + step*fncA_approx(height(k),t(k)); 
 k = k+1; 
 end; 
height'

Answer 1

来自documentation

Use the Vars argument to specify the order of input arguments for the generated MATLAB function.

syms x y z t
r = (x + y/2 + z/3)*exp(-t);
matlabFunction(r,'Vars',{t,x,z,y})

ans = 
    @(t,x,z,y)exp(-t).*(x+y.*(1.0./2.0)+z.*(1.0./3.0))

如何为生成的函数排序输入参数

How to order input arguments for a generated function

matlab

arguments

input

output