Why is my code producing a 0's at the 11th Column

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William david
William david il 27 Lug 2023
Risposto: C B il 27 Lug 2023
All of a sudden the 11th column of p is falling to zero and stays that way for the rest of the columns following it. I see no reason for this as the variables used to compute p do not change randomly.
clear all; clc; close all;
tic;
z1 = 1;
z1 = 2;
z2 = 2*z1;
z = [z1,z2];
la1 = 1/3;
la2 = 1/3;
la = [la1,la2];
z_ave = (z1*la2 + z2*la1)/(la1 + la2);
sigma = 0.75;
theta = sigma/(sigma-1);
pe = 1.68;
xi = 0.01:0.01:0.2;
pe = linspace(1,1.5,100);
p = zeros(length(xi),length(pe))
for i = 1:20
for j = 1:10
p(i,j) = (1+xi(i)*pe(j)^theta)^(1/theta)
end
end
plot(pe,p(1,:))
I expect the values to stay around 0.94 and lower, but there seems to be a problem.

Risposte (2)

Star Strider
Star Strider il 27 Lug 2023
Could it be because that is how you defined it?
xi = 0.01:0.01:0.2;
pe = linspace(1,1.5,100);
p = zeros(length(xi),length(pe))
It seems that ‘p’ is preallocated as a (30x100) matrix of zeros (preallocation is good programming practice), and you are onlly writing tto the first 20 rows and the first 10 columns of it.
.

C B
C B il 27 Lug 2023
Looking at pe(j), i think your J loop should run for length of pe, is this what you are expecting?
z1 = 1;
z1 = 2;
z2 = 2*z1;
z = [z1,z2];
la1 = 1/3;
la2 = 1/3;
la = [la1,la2];
z_ave = (z1*la2 + z2*la1)/(la1 + la2);
sigma = 0.75;
theta = sigma/(sigma-1);
pe = 1.68;
xi = 0.01:0.01:0.2;
pe = linspace(1,1.5,100)
pe = 1×100
1.0000 1.0051 1.0101 1.0152 1.0202 1.0253 1.0303 1.0354 1.0404 1.0455 1.0505 1.0556 1.0606 1.0657 1.0707 1.0758 1.0808 1.0859 1.0909 1.0960 1.1010 1.1061 1.1111 1.1162 1.1212 1.1263 1.1313 1.1364 1.1414 1.1465
p = zeros(length(xi),length(pe));
length(pe)
ans = 100
for i = 1:length(xi)
for j = 1:length(pe)
p(i,j) = (1+xi(i)*pe(j)^theta)^(1/theta);
end
end
plot(pe,p(1,:))

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