??? Subscript indices must either be real positive integers or logicals.

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ghassan 2013-5-6

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关闭： MATLAB Answer Bot 2021-8-20

hi, i'm using m file in cell mode to solve f(x)=sin (x), where x = 0.8 and i'm getting "??? Subscript indices must either be real positive integers or logicals. " error how it can be solved

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Gijs van Oort 2013-5-6

Please tell us the exact code you're using. Is it actually Matlab code? The code you're giving ('solve f(x)=sin(x)' ) is not Matlab compatible.

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John Doe 2013-5-6

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编辑：John Doe 2013-5-6

在 MATLAB Online 中打开

Is this what you're trying to do?

%%Don't run this part
A = magic(4);
%%Run this part by itself
x = 0.8;
f = sin(x)
%%Not this part
A = rand(4);

What you do is: Place your cursor in the middle section. Then press Ctrl + Enter.

Please watch this video:

http://blogs.mathworks.com/videos/2011/07/26/starting-in-matlab-cell-mode-scripts/

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ghassan 2013-5-6

%% x= 0.8; f = x^2 ; exact = 2*x; for k=1:10; h(k)=10^-k; end for k=1:10; fapp(x)=((x+h(k)^2)-x^2)/h(k); end fapp error = abs (exact-fapp)

im trying to use this code in cell mode and the following error appears

??? Subscript indices must either be real positive integers or logicals.

Jan 2013-5-6

Please, ghassan, format your code properly. Follow the "? Help" link to learn how to use the forum's interface. Thanks.

It would be helpful, if you post the complete error message and explain, in which line the problem occurres. Then we do not have to guess the details.

It is more complicated to answer to information, which is provided in the comment section. Please collect all required information in the original question, for this reason editing the questions has been introduced in this forum.