Array indices must be positive integers or logical values.

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Camille Molsick-Gibson
评论： Camille Molsick-Gibson 2020-6-2
I keep getting the error "Array indices must be positive integers or logical values" on every equation within the for loop and I'm not sure what I'm doing wrong. I've looked through other posts with this error and I can't seem to find my error
clear
clc
% Set known variables
rho = 800; % kg/m^3
mu = 0.00035; % N*s/m^2
Q = 2; % m^3/s
n = 25; % unitless
g = 9.81; % m/s^2
L = 160934; % m
m_dot = rho*Q;
H = L/(m_dot*g);
D = 1:0.1:10;
for n = 1:length(D)
P(D) = (128*mu*(Q^2)*L)./(pi*(D.^4));
CQ(D) = (P)./(rho*(n^3)*(D.^5));
CH(D) = (g*H)./((n^2)*(D.^2));
CQ(D) = Q./(n*(D.^3));
end

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回答（1 个）

madhan ravi
madhan ravi 2020-6-2
Left hand side of the equation (n) and in right hand side D(n).
And Ofcourse you don’t need a loop here ;)
  2 个评论
madhan ravi
madhan ravi 2020-6-2
% Set known variables
rho = 800; % kg/m^3
mu = 0.00035; % N*s/m^2
Q = 2; % m^3/s
n = 25; % unitless
g = 9.81; % m/s^2
L = 160934; % m
m_dot = rho*Q;
H = L/(m_dot*g);
D = 1:0.1:10;
n = 1:numel(D);
P = (128*mu*(Q^2)*L)./(pi*(D.^4));
CQ = P ./(rho*(n.^3).*(D.^5));
CH = (g*H)./((n.^2).*(D.^2));
CQ = Q./(n.*(D.^3));

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