Error "Index in position 2 is invalid."
조회 수: 7 (최근 30일)
이전 댓글 표시
%Heres the code I am working with.
gmat=zeros(118,400);
fid1=fopen('tomo_data.txt','r');
gdata= fscanf(fid1,'%f %f %f',[3,1600]);
for i=1:1600
gmat(gdata(1,i),gdata(2,i)) = gdata(2,i);
end
Heres the error:
Index in position 2 is invalid. Array indices must be positive integers or logical values.
Error in ch5q2b (line 16)
gmat(gdata(1,i),gdata(2,i)) = gdata(2,i);
Attached to this question is the txt file used. Any help would be appriciated.
댓글 수: 2
Guilherme
2022년 10월 21일
What's your final goal with yoour code? The problem you're facing is that your file has multiple floating points and this is probably what is causing the error of "index in position x is invalid".
The following code is, for instance invalid and has the exact same error as yours:
a = zeros(5,5);
a(1,0.5)
Also, you're creating all your code (vector and for) with predetermined values. This may not be a good practice if your input text change in the future. Instead you could go with something like:
fid1=fopen('tomo_data.txt','r');
gdata= fscanf(fid1,'%f %f %f',[3,1600]);
gmat = zeros(size(gdata));
Therefore, it'd be better if we could try to really understand what you're trying to do :D
답변 (1개)
Cris LaPierre
2022년 10월 21일
The error is because your second index, the column index for gmat, which is gdata(2,i), is 0. That is not a valid index. Indices in MATLAB must be positive integers (or logicals).
gmat = 1:3;
% works
gmat(1,1)
% your error
gmat(1,0)
댓글 수: 6
Cris LaPierre
2022년 10월 24일
The error has been explained, but we don't have enough detail to tell you what it should be doing instead.
참고 항목
카테고리
Help Center 및 File Exchange에서 Get Started with MATLAB에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!