清空筛选条件
清空筛选条件

Error R_tilde = builtin('s​ubsref',L_​tilde,Idx)​;

53 次查看（过去 30 天）
Fahad Ramzan
Fahad Ramzan 2021-4-12
回答： Cris LaPierre 2022-8-23
Ran in:
clc;
clear all
syms x y F(y)
f(y)=(10./3).*((x).*(y.^(2./5)));
eqn=diff(F(y))==f(y);
cond = [y(0) == 4];
Array indices must be positive integers or logical values.

Error in indexing (line 1075)
R_tilde = builtin('subsref',L_tilde,Idx);
sol=vpa (dsolve(eqn,cond))
I am Receving these errors.
Subscript indices must either be real positive integers or logicals.
R_tilde = builtin('subsref',L_tilde,Idx);
cond = [y(0) == 4];

请先登录，再回答此问题。

回答（1 个）

Cris LaPierre
Cris LaPierre 2022-8-23
Ran in:
The error is because y is a variable, not a function, so y(0) is being treated as an indexing operation. Since MATLAB uses 1-based indexing, it is returning an error. Perhaps you meant to write f(0) in your condition statement?
y=1:3;
% works
y(2)
ans = 2
% your error
y(0)
Array indices must be positive integers or logical values.

类别

在 Help Center 和 File Exchange 中查找有关 Ordinary Differential Equations 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by