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

Question

Ryan Scott 2020-5-8

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/524112-operator-is-not-supported-for-operands-of-type-table

评论： Marco Riani 2024-4-16

FinalProj_TVdata.csv

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.

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Marco Riani 2024-4-16

在 MATLAB Online 中打开

FinalProj_TVdata.csv

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) 
    ______

46
37
72
71
78
93
34
04
36
93
98
26
4
15
21
71

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Answer 1

Ameer Hamza 2020-5-8

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/524112-operator-is-not-supported-for-operands-of-type-table#answer_431307

编辑：Ameer Hamza 2020-5-8

在 MATLAB Online 中打开

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; 

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Ameer Hamza 2020-5-8

编辑：Ameer Hamza 2020-5-8

I am glad to be of help.

Stephen23 2020-5-9

"...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: