Operator '-' is not supported for operands of type 'table'.

X = readtable('FinalProj_TVdata.csv');
Y = readtable('FinalProj_Pdata.csv');
%Convert from Fahrenheit to Kelvin
TempK = ((X(:,1)-32)*5/9)+273.15;
%Determine Volume
V = X(:,2)*0.028;

So I have been attempting to find the temperature and volume using this code, but I am having troubles.

[Marco Riani]

This is just to notice that starting from 2023A the syntax below is valid and there is now no need to use {} or table2array (array2table)

 X = readtable('FinalProj_TVdata.csv','VariableNamingRule','preserve');
TempK = ((X(:,1)-32).*(5/9))+273.15

TempK = 300x1 table
    T (F) 
    ______

    290.46
    291.37
    288.72
    296.71
    287.78
    294.93
    294.34
    294.04
    295.36
    298.93
    293.98
    292.26
     295.4
    289.15
    294.21
    296.71

Answer 1

[Ameer Hamza]

table elements need to be accessed using brace indexing. Try this

X = readtable('FinalProj_TVdata.csv');

TempK = ((X{:,1}-32)*5/9)+273.15;
%Determine Volume
V = X{:,2}*0.028;

Alternative

You can convert the table to array and then use normal indexing

X = table2array(readtable('FinalProj_TVdata.csv'));

TempK = ((X(:,1)-32)*5/9)+273.15;
%Determine Volume
V = X(:,2)*0.028; 

[Ryan Scott]

Yep that worked I didn't know table elements needed braces. Thank you!

[Ameer Hamza]

I am glad to be of help.

[Stephen23]

"...I didn't know table elements needed braces."

They don't need them, it depends entirely on what you want to achieve. Like all MATLAB indexing, indexing using parentheses always returns an array of exactly the same class, so if you use parentheses then you will get a table, whereas curly braces refers to the contents of the container array. So for a table:

• () returns another table
• {} returns the contents of the table.

This is explained in the MATLAB documentation:

https://www.mathworks.com/help/matlab/matlab_prog/access-data-in-a-table.html

The same principle applies to other container arrays too, e.g. cell arrays, string arrays.