I need to make a table that has column names "Radii", "SurfaceA", and "Volume". But when I display the table it names the columns "Var1", "Var2", and "Var3". What is causing this?

Im also brand new to Matlab, if there's some easy way to optimize this please let me know.

Radii = [0.050:0.050:0.300];
SurfaceA = [];
Volume = [];
for i = 1:length(Radii)
    SurfaceA(i) = 4*pi*Radii(i)^2;
    Volume(i) = (4*pi*Radii(i)^3)/3;
end
Sphere = table(Radii',SurfaceA',Volume');
disp("#1")
disp("Sphere = ")
fprintf("\n")
disp(Sphere)

This returns

#1
Sphere = 

    Var1      Var2        Var3   
    ____    ________    _________

    0.05    0.031416    0.0005236
     0.1     0.12566    0.0041888
    0.15     0.28274     0.014137
     0.2     0.50265      0.03351
    0.25      0.7854      0.06545
     0.3       1.131       0.1131

Should be

#1
Sphere = 

    Radii   Surface A     Volume   
    ____    ________    _________

    0.05    0.031416    0.0005236
     0.1     0.12566    0.0041888
    0.15     0.28274     0.014137
     0.2     0.50265      0.03351
    0.25      0.7854      0.06545
     0.3       1.131       0.1131

I need to make a table that has column names "Radii", "SurfaceA", and "Volume". But when I display the table it names the columns "Var1", "Var2", and "Var3". What is causing this?

Im also brand new to Matlab, if there's some easy way to optimize this please let me know.

Radii = [0.050:0.050:0.300];
SurfaceA = [];
Volume = [];
for i = 1:length(Radii)
    SurfaceA(i) = 4*pi*Radii(i)^2;
    Volume(i) = (4*pi*Radii(i)^3)/3;
end
Sphere = table(Radii',SurfaceA',Volume');
disp("#1")
disp("Sphere = ")
fprintf("\n")
disp(Sphere)

This returns

#1
Sphere = 

    Var1      Var2        Var3   
    ____    ________    _________

    0.05    0.031416    0.0005236
     0.1     0.12566    0.0041888
    0.15     0.28274     0.014137
     0.2     0.50265      0.03351
    0.25      0.7854      0.06545
     0.3       1.131       0.1131

Should be

#1
Sphere = 

    Radii   Surface A     Volume   
    ____    ________    _________

    0.05    0.031416    0.0005236
     0.1     0.12566    0.0041888
    0.15     0.28274     0.014137
     0.2     0.50265      0.03351
    0.25      0.7854      0.06545
     0.3       1.131       0.1131

• matlab
• matlab-table

1 Answer 1

When you construct a table, the table variables only pick up the names from the names of the input workspace variables if you don't perform an operation on those input workspace variables. (In that case, you're effectively passing in to the table constructor unnamed temporary arrays).

You can either:

1. Operate on the arrays up-front and store them back in named variables that you pass directly to the table constructor, or

   Radii = Radii';
   SurfaceA = SurfaceA';
   Volume = Volume';
   Sphere3 = table(Radii,SurfaceA,Volume)
   

2. Use the name-value argument VariableNames=["Radii", "Surface A", "Volume"])

   Sphere2 = table(Radii', SurfaceA', Volume', ...
       VariableNames=["Radii", "Surface A", "Volume"])