How do I change a string or number in a table?

I have a table containing columms of codes, names and numbers.

How do I change a unit in the table?

I have tried grades{2,2}='Martin';

But this does not work for a table.

[Image Analyst]

Which elements or columns contain the units? Are the units names all in column 2 of the table, and column 2 is a column of all strings?

Answer 1

[Peter Perkins]

Mathilde, I think with that syntax, you just need to wrap that string in curly braces in order to assign it into a variable that's a cell array of strings:

>> grades = table([1;2;3],{'Robin';'Sparrow';'Finch'},[70;80;90],'VariableNames',{'Code' 'Name' 'Number'})
grades = 
    Code      Name       Number
    ____    _________    ______
    1       'Robin'      70    
    2       'Sparrow'    80    
    3       'Finch'      90    
>> grades{2,2} = 'Martin'
RHS should have 1 columns. 
>> grades{2,2} = {'Martin'}
grades = 
    Code      Name      Number
    ____    ________    ______
    1       'Robin'     70    
    2       'Martin'    80    
    3       'Finch'     90

The idea is that grades{2,2} is the second element of the Names variable, and that is itself a 1x1 cell array, and so the right hand side of the assignment should be a 1x1 cell array. This is a bit confusing, because it involves braces for both the table and for the strings.

But there's a much simpler syntax:

>> grades.Name{2} = 'Oriole'
grades = 
    Code      Name      Number
    ____    ________    ______
    1       'Robin'     70    
    2       'Oriole'    80    
    3       'Finch'     90

grades.Name(2) is a 1x1 cell array, but grades.Name{2} is the contents of that cell, in this case a string.

Hope this helps.