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Subscript indices must either be real positive integers or logicals

2 次查看（过去 30 天）
MATLABmet
MATLABmet 2017-10-23
关闭： MATLAB Answer Bot 2021-8-20
getting this error when trying to build a set of data from a data store with the following code. I would like for every iteration of the for loop (one read from the data store), to add data to the table.
if true
clear
clc
ds = fileDatastore(fullfile('***example****);
tf = hasdata(ds);
i = 0
while (tf == 1);
accData(i,:) = read(ds); %read from datastore
tf = hasdata(ds);
i = i+1
end
thanks in advance

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回答（3 个）

Image Analyst
Image Analyst 2017-10-23
Walter Roberson
Walter Roberson 2017-10-23
You initialize i = 0, and then assign to accData(i,:) which tries to use that 0 as the index. You should do the i = i + 1 before using i as the index.
Jeremy Hughes
Jeremy Hughes 2017-10-25
Very common error. =) MATLAB arrays start at index = 1. You should see the same error from x(0,:) = 1.
In this case, I don't think you need the loop at all. Use the readall function:
accData = readall(ds)

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