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

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?

Answer 1

[Voss]

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)

[Eris Bolduc]

Thank you very much, makes sense now!

[Voss]

You're welcome!

[Kalyani Ghuge]

Great answer bro! Thank you!

Answer 2

[Image Analyst]

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-')

[Eris Bolduc]

Thank you very much, now I understand what's going on.