Why do I get the error "Undefined function or variable"?

2018 2 28
1 个回答
更新时间：2018 2 28
6 次查看（30 天）

0 个投票

I am receiving the following error message, how can I resolve this issue?
fungsi6 = zeros(:,i1);
for i1=1:c
fungsi6(:,i1)=c(1,i1) + c(2,i1)*x(i1,:)' + c(3,i1)*lat' + c(4,i1)*lon' + c(5,i1)*dem'
end

13 个评论
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Adam
Adam 2018-2-28
Make sure that c, x, lat, lon and dem are all defined.
Ardi Nur Armanto
Ardi Nur Armanto 2018-2-28
I have defined c, x, lat, lon and dem and it's coming from command window
Undefined function or variable 'zeros'.
Error in errorKoreksi_Sta (line 19)
fungsi6 = zeros(:,i1);
Walter Roberson
Walter Roberson 2018-2-28
It is not recommended to try to name a variable "zeros" as that is the name of of an important function to allocate memory that is initialized to 0. In its function form you would never pass a : to it.
Rik
Rik 2018-2-28
Rename the variable zeros. The problem is not with this loop, but with how you are trying to define fungsi6. If you show us the 18 lines before this, we might be able to give more specific advice.
Ardi Nur Armanto
Ardi Nur Armanto 2018-2-28
this is the full lines
clear;clc;
y1 = xlsread('E:\Skripsi\Data debit & klimatologi\Database Curah Hujan\observasi1986_1987.xlsx');y=y1(4:end,:);
x = xlsread('E:\Skripsi\Data debit & klimatologi\Database Curah Hujan\data chirps 1986-1987.xlsx'); % CHIRPS sesuai koordinat stasiun observasi
lat=y1(1:end,:); % Lintang
lon=y1(2:end,:); % Bujur
dem=y1(3:end,:); % Elevasi
%regresi linear berganda untuk mendapatkan koefisien setiap vaiabel
c = zeros(6,730); %730 nunjukin jumlah hari yg dipakai
for i=1:c
XX = [ones(size(x(i,:)))' x(i,:)' lat' lon' dem'];
c(:,i) = XX.\y(i,:)';
end
%%menghitung curah hujan dugaan stasiun
for i1=1:c
fungsi6(:,i1)=c(1,i1) + c(2,i1)*x(i1,:)' + c(3,i1)*lat' + c(4,i1)*lon' + c(5,i1)*dem'; %6 jumlah stasiun obs
end
%menghitung error curah hujan dugaan stasiun
errordata19861987 = y - fungsi6';
dlmwrite('E:\Skripsi\Bias Koreksi\ErrorChirpsSta_1986-1987.txt',errordata19861987','\t');
Adam
Adam 2018-2-28
What exactly are you trying to do here?
fungsi6 = zeros(:,i1);
Guillaume
Guillaume 2018-2-28
This is a different code from the one in your original question. So we have absolutely no idea which line or which code is causing the error.
Therefore, please confirm the exact code you are using and give us the entire error message without any modification. Just copy and paste everything in red.
Ardi Nur Armanto
Ardi Nur Armanto 2018-2-28
this is the entire error message
Undefined function or variable 'zeros'.
Error in errorKoreksi_Sta (line 19)
fungsi6 = zeros(:,i1);
Ardi Nur Armanto
Ardi Nur Armanto 2018-2-28
there is warning like
the variable 'fungsi6' appears to change size in every loop iteration
it appears when i didn't write fungsi6 = zeros(:,i1);
Walter Roberson
Walter Roberson 2018-2-28
I doubt that anyone remembers what the .\ operator does so I would not use that without a comment
Guillaume
Guillaume 2018-2-28
The line in the error message does not appear in the code you've posted. How do you explain that?
Ardi Nur Armanto
Ardi Nur Armanto 2018-2-28
it appears when i delete the . in line 14 Undefined function or variable 'fungsi6'.
Error in errorKoreksi_Sta (line 24)
errordata19861987 = y - fungsi6';

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回答（1 个）

Walter Roberson
Walter Roberson 2018-2-28

0 个投票

When you use an array as the end point of a : operator the first element of the array is extracted and the rest are ignored. Your
for i1=1:c
Is the same as
for i1=1:c(1,1)
This would not execute even once if c(1,1) was not at least 1, and since you do not initialize the variable assigned to in the loop that would leave the variable undefined.
I see no reason to expect that c(1,1) should be at least 1.

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