Index in position 1 is invalid Problem

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Shariful Islam
Shariful Islam 2022-10-14
回答： Eric Delgado 2022-10-14
clear all
close all
clc
h = input('Enter the step size: '); %240
tf = input('Final Value: '); %480
t = 0:h:tf
th = zeros(1,length(t))
th(1) = input('Enter the initial value: '); %1200
fun = input("Enter the function with respect to th: "); %((-2.2067.*(10.^-12)).*((th.^4)-(81.*10^8)))
k_1 = fun(t(1), th(1))
Dear altruist,
This is my code, but it tells me that: "Index in position 1 is invalid. Array indices must be positive integers or logical
values."
Kindly help me with this.

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回答（1 个）

Eric Delgado
Eric Delgado 2022-10-14
Ran in:
Try this...
x = [0,240,480];
y = [1200,0,0];
Fcn_AddThings = str2func('@(x,y) x.^2 - 2*y');
Fcn_AddThings(x, y)
ans = 1×3
-2400 57600 230400
Fcn_AddThings(x(1), y(1))
ans = -2400
Looking at your example, you can replace str2fun for input - see the image below.

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