nothing assing to my variable that is in if statement

1 次查看（过去 30 天）
arash rad
arash rad 2022-12-1
评论： Mathieu NOE 2022-12-1
hello I wrote a code and it has 5 x and 3 y .
and with different conditions of x, a value should assign to y , but when i run my code in if statement no value assign to y and I wrote y(:,i) = Gt_new(1)
what should i do ?
thank you
my code is
clc; clear all ;close all
warning off
x1 = randi([0,5],1,10);
x = zeros(1,5);
P = 50;
for i = 1:length(x1)/2
x(:,i) = x1(:,2*i) - x1(:,(2*i)-1);
end
xmin = min(x);
xmax = max(x);
Gt = 40
dx = 10;
Gt_new = Gt + [+dx 0 -dx];
y1 = find(x<0)
y2 = find(x == 0)
y3 = find(x>0)
y = zeros(1,5);
for i = 1:length(x)/2
if x < 0
y(:,i) = Gt_new(1)
end
end

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回答（1 个）

Mathieu NOE
Mathieu NOE 2022-12-1
hello
you need to index x in the for loop
for i = 1:length(x)/2
if x(i) < 0 % here
y(:,i) = Gt_new(1)
end
end
  2 个评论
arash rad
arash rad 2022-12-1
Hi thank you for your answer
I did this but yet nothing happen
Mathieu NOE
Mathieu NOE 2022-12-1
Ran in:
hello again
your original code gives y = 0 0 0 0 0
the modified code gives another output : y = 0 50 0 0 0
(depends what randi generated in first insyance)
x1 = randi([0,5],1,10);
x = zeros(1,5);
P = 50;
for i = 1:length(x1)/2
x(:,i) = x1(:,2*i) - x1(:,(2*i)-1);
end
xmin = min(x);
xmax = max(x);
Gt = 40
Gt = 40
dx = 10;
Gt_new = Gt + [+dx 0 -dx];
y1 = find(x<0)
y1 = 1×4
1 3 4 5
y2 = find(x == 0)
y2 = 1×0 empty double row vector
y3 = find(x>0)
y3 = 2
y = zeros(1,5);
for i = 1:length(x)/2
if x(i) < 0
y(:,i) = Gt_new(1)
end
end
y = 1×5
50 0 0 0 0
y
y = 1×5
50 0 0 0 0

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