Invalid Subscript for Y, the table variable must be numeric array

2022 5 8
2 个回答
回答已采纳
更新时间：2023 3 29
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1 个投票

I am trying to plot the first 1000 data from the imported txt. file and I keep getting the error message and no idea how to slove it.
Does it mean the data from the second column are not the intergers?

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Voss
Voss 2022-5-8
Ran in:

5 个投票

Ran in:
First and Second are tables. Use curly braces {} rather than parentheses () to get the data out of a table:
A = table([1;2;3;4;5],[10;20;30;40;50]);
% first, reproducing the error
First = A(:,1) % tables
First = 5×1 table
Var1 ____ 1 2 3 4 5
Second = A(:,2)
Second = 5×1 table
Var2 ____ 10 20 30 40 50
try
plot(First,Second)
catch ME
disp(ME.message)
end
Invalid subscript for Y. A table variable subscript must be a numeric array containing real positive integers, a logical array, a character vector, a string array, a cell array of character vectors, or a pattern scalar matching one or more variable names.
% now, the solution
First = A{:,1} % numeric arrays
First = 5×1
1 2 3 4 5
Second = A{:,2}
Second = 5×1
10 20 30 40 50
plot(First,Second)

更多回答（1 个）

Image Analyst
Image Analyst 2022-5-8

0 个投票

Use braces
A = table(rand(1300, 1), rand(1300, 1))
x = A{1 : 1000, 1}
y = A{1:1000, 2}
plot(x, y, 'b-')
Or like this:
A = table(rand(1300, 1), rand(1300, 1), 'VariableNames', {'X', 'Y'});
plot(A.X(1:1000), A.Y(1:1000), 'b-')

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