# Index exceeds the number of array elements. Index must not exceed 1.

18 views (last 30 days)
Alina Abdikadyr on 8 Feb 2023
Commented: Les Beckham on 8 Feb 2023
Could you please help me to solve the problem. I'm trying to calculate the difference between heights in a loop.
But it gives error "Index exceeds the number of array elements. Index must not exceed 1."
My code is
clear all; close all
W = 10000;
S = 40;
AR = 7;
cd0 = 0.005;
k = 1 / pi / AR;
j=0;
hv=6:-.01:0;
figure(1);hold on; xlabel('h');ylabel('V')
for h1=6:-.01:0
j=j+1;
cdminp=4*cd0;
rho1(j)=1.225*exp(-h1/10.4);
clminp=sqrt(3*cd0/k);
Vminp(j)=sqrt(2*W/rho1(j)/S/clminp);
dh(j)=h1(j)-h1(j+1);
end
figure(1); plot(hv, Vminp);
set(gca, 'XDir','reverse');
Les Beckham on 8 Feb 2023
If you know what the h1 vector is already, you don't need a loop to calculate the accumulated difference between elements of it.
h1=6:-.01:0;
dh = -cumsum(diff(h1));
dh(1:10) % look at the first ten elements
ans = 1×10
0.0100 0.0200 0.0300 0.0400 0.0500 0.0600 0.0700 0.0800 0.0900 0.1000

Dyuman Joshi on 8 Feb 2023
You can do that without the loop
W = 10000;
S = 40;
AR = 7;
cd0 = 0.005;
k = 1 / pi / AR;
hv = 6:-.01:0;
cdminp = 4*cd0;
clminp = sqrt(3*cd0/k);
rho1 = 1.225.*exp(-hv./10.4);
Vminp = (2.*W./rho1./S).^(1/2);
dh = hv(1)-hv(2:end)
dh = 1×600
0.0100 0.0200 0.0300 0.0400 0.0500 0.0600 0.0700 0.0800 0.0900 0.1000 0.1100 0.1200 0.1300 0.1400 0.1500 0.1600 0.1700 0.1800 0.1900 0.2000 0.2100 0.2200 0.2300 0.2400 0.2500 0.2600 0.2700 0.2800 0.2900 0.3000
figure(1);
hold on;
xlabel('h');ylabel('V')
plot(hv,Vminp)
set(gca, 'XDir','reverse'); ### Categories

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