Inserting additional data in an already created table

Question

Jason 2025-5-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2177043-inserting-additional-data-in-an-already-created-table

回答： Image Analyst 2025-5-10

Hello, Im messing around with tables again and create one from the user inputs from inputdlg

    prompt = {'Soak(s)','Soak Move (ymm)','Laser Volts (Soak, Image)','numImages(afterSOAK)','ZTLpos(soak), abs','Back To Nominal Wait Time(s)','NumImages (Back To Nominal)'};            
    dlgtitle = 'Laser Soak';
    dims = [1 35];
    definput = {'30','-1','2, 0.18','4','-1833','60','12'};
    answer = inputdlg(prompt,dlgtitle,dims,definput);  
    answer
    T = table(char(answer))
            

I want to add another entry to the end and thought this would do it

    defaultZTL='-2000';
    T(end+1,1)={defaultZTL}  
    

But Im getting this error

    Assigning to a character variable in a table is only supported when the right-hand side value is a table. Consider using a string
variable in the table for text data.
Error in HTS_TestSoftware/LaserSOAKButtonPushed (line 12557)
           T(end+1,1)={defaultZTL}

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Jason 2025-5-9

编辑：Jason 2025-5-9

在 MATLAB Online 中打开

I've also tried to create a new table for the additonal row

    T = table(char(answer)) 
    rnames={'Soak(s)','Soak Rel. Pos (mm)','Soak/Image Laser (V)',['#Fast Images(PostSoak) @ ',num2str(afterSoakPause),'s'],'ZTL (Soak)','Return To Nom(ztl). Wait(s)','#Images(Return To Nom ztl)'}'
    T.Properties.RowNames=rnames
    T.Properties.VariableNames={'Input'};
    % Add new row by creating another table
    defaultZTL='-2000';
    Tnew = table(defaultZTL,'RowNames',{'ZTL default Pos'}) ;
    T = [T ; Tnew]    

     Incorrect number of arguments.
Error in HTS_TestSoftware/LaserSOAKButtonPushed (line 12564)
             Tnew = table(defaultZTL,'RowNames',{'ZTL default Pos'}) ;

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Answer 1

Cris LaPierre 2025-5-9

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https://ww2.mathworks.cn/matlabcentral/answers/2177043-inserting-additional-data-in-an-already-created-table#answer_1564990

编辑：Cris LaPierre 2025-5-9

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The issue is that char arrays must be padded so that they all have the same length. The value you are assigning does not have the same width as the other values in the table.

The simplest solution is to use strings instead.

answer = {'30','-1','2, 0.18','4','-1833','60','12'}';
T = table(string(answer))
T = 7x1 table
      Var1   
    _________

    "30"     
    "-1"     
    "2, 0.18"
    "4"      
    "-1833"  
    "60"     
    "12"     
defaultZTL = '-2000';
T(end+1,1) = {defaultZTL}
T = 8x1 table
      Var1   
    _________

    "30"     
    "-1"     
    "2, 0.18"
    "4"      
    "-1833"  
    "60"     
    "12"     
    "-2000"  

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Cris LaPierre 2025-5-9

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Good call. I was getting width errors at some point in my debugging and didn't fully troubleshoot.

Using curly braces indexes a table as an array. What is assigned has to match the data type of the array.
Using parentheses indexes the table as a table. What is assigned must be a table.

T{end+1,1} = 'one!!' works because the left and right side are char arrays of width 5

T{end+1,1} = 'one' doesn't work because the left side is a char arrays of width 5 and the right side is a char array of width 3

T{end+1,1} = {'two!!'} doesn't work because the left side in a char array and the right is a cell array.

T(end+1,1) = {'two!!'} doesn't work because the left side in a table and the right is a cell array.

The string datatype is more flexible than char. The following commands all work if the table variable type is string

T = table(["hello";"world"]);
T(end+1,1) = {'two!!'}
T = 3x1 table
     Var1  
    _______

    "hello"
    "world"
    "two!!"
T{end+1,1} = {'two!!'}
T = 4x1 table
     Var1  
    _______

    "hello"
    "world"
    "two!!"
    "two!!"
T(end+1,1) = {"two!!"}
T = 5x1 table
     Var1  
    _______

    "hello"
    "world"
    "two!!"
    "two!!"
    "two!!"
T{end+1,1} = "two"
T = 6x1 table
     Var1  
    _______

    "hello"
    "world"
    "two!!"
    "two!!"
    "two!!"
    "two"  
T.Var1(end+1) = "two"
T = 7x1 table
     Var1  
    _______

    "hello"
    "world"
    "two!!"
    "two!!"
    "two!!"
    "two"  
    "two"  
T.Var1{end+1} = 'two'
T = 8x1 table
     Var1  
    _______

    "hello"
    "world"
    "two!!"
    "two!!"
    "two!!"
    "two"  
    "two"  
    "two"  

Voss 2025-5-10

在 MATLAB Online 中打开

Say this is your table

T = table(["30";"-1"],'RowNames',{'Soak(s)';'Soak Rel.'})
T = 2x1 table
                 Var1
                 ____

    Soak(s)      "30"
    Soak Rel.    "-1"

and you add the new row

T(end+1,1) = {"2, 0.18"}
T = 3x1 table
                   Var1   
                 _________

    Soak(s)      "30"     
    Soak Rel.    "-1"     
    Row3         "2, 0.18"

then you can set the new row name

T.Properties.RowNames{end} = 'new name'
T = 3x1 table
                   Var1   
                 _________

    Soak(s)      "30"     
    Soak Rel.    "-1"     
    new name     "2, 0.18"

Cris LaPierre 2025-5-10

在 MATLAB Online 中打开

To add to Voss' response, rownames are stored in the table metadata. They are accessed through the table properties. I don't think you can update rownames when using a cell array to add a table row

Another option that would work is to add the names as a 2nd table column. Then you can update both while using the cell array approach.

input = string({'30','-1','2, 0.18','4','-1833','60','12'})';
rnames=string({'Soak(s)','Soak Rel. Pos (mm)','Soak/Image Laser (V)','#Fast Images(PostSoak) @ 0.5s','ZTL (Soak)','Return To Nom(ztl). Wait(s)','#Images(Return To Nom ztl)'})';
T = table(rnames,input)
T = 7x2 table
                rnames                   input  
    _______________________________    _________

    "Soak(s)"                          "30"     
    "Soak Rel. Pos (mm)"               "-1"     
    "Soak/Image Laser (V)"             "2, 0.18"
    "#Fast Images(PostSoak) @ 0.5s"    "4"      
    "ZTL (Soak)"                       "-1833"  
    "Return To Nom(ztl). Wait(s)"      "60"     
    "#Images(Return To Nom ztl)"       "12"     
defaultZTL = '-2000';
T(end+1,:) = {'defaultZTL',defaultZTL}
T = 8x2 table
                rnames                   input  
    _______________________________    _________

    "Soak(s)"                          "30"     
    "Soak Rel. Pos (mm)"               "-1"     
    "Soak/Image Laser (V)"             "2, 0.18"
    "#Fast Images(PostSoak) @ 0.5s"    "4"      
    "ZTL (Soak)"                       "-1833"  
    "Return To Nom(ztl). Wait(s)"      "60"     
    "#Images(Return To Nom ztl)"       "12"     
    "defaultZTL"                       "-2000"  

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Answer 2

Image Analyst 2025-5-10

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Try the function made for adding columns to tables: addvars

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