MATLAB Answers

I get Subscript indices must either be real positive integers or logicals.

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if true
% N = 5000;
z = 2*randn(N,1);
x = (-9:0.25:9);
z1 = reshape(z,[10,500]);
y = mean(z1);
sdy = std(y);
E = exp(-(x.^2)./(2*(sdy^2)));
DeltaNy = (500./(sdy*sqrt(2*pi))).*E.*0.25;
plot(x,DeltaNy,'r-');
end
I have to use the formula for delta n which depends on the standard deviation of y but this values is too small and
I get Subscript indices must either be real positive integers or logicals. I don't know how to make the formula work, I need it to plot the normal distribution on a histogram. I have to use THAT formula and cant change it.

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Accepted Answer

Star Strider
Star Strider on 14 Nov 2017
The code you posted runs without error for me (in R2017b).
If it is throwing an error, please copy the complete error message (all the red text) from your Command Window and paste it to a Comment here.

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Gonzalo Reina
Gonzalo Reina on 14 Nov 2017
yep found it, thanks a lot I hate it when I get errors that are easy to fix but I just can't get. I just started with matlab after all
Image Analyst
Image Analyst on 25 Sep 2018
When k is 1, then k-5 is -4. You can't have a negative 4 as the row number of a matrix.

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