problem accessing array of imported CSV file

Hello, after importing CSV file i have a variable 1D array called col

but when i try to accsess it in different forms as shown bellow it gives me those errors.

only when i did col(1) it worked.

when do i use each tipe of parenthsis in arrays?

Thanks.

Answer 1

[Image Analyst]

You need to use parentheses, not brackets:

col(1)

See the FAQ:

https://matlab.fandom.com/wiki/FAQ#What_is_a_cell_array.3F

for an explanation for when to use each. In general, parentheses are for elements themselves. Brackets define arrays. Braces mean "contents of" container variables like cell arrays and tables.