Error using plot Invalid data argument.

This is my program. Need help to solve it.

clc;
t = readtable('error graph.xlsx','Sheet','Sheet1');
x = t.ModelName;
y = t.Rmse;
z = t.R_2;
plot(x,y)
hold on
plot(x,z)
hold on

Answer 1

[Walter Roberson]

I would guess that you need

plot(categorical(x), y)

and

plot(categorical(x), z)

Answer 2

[Voss]

Try replacing

x = t.ModelName;

with

x = categorical(t.ModelName);

And run the code again.

If that doesn't work, attach the xlsx file using the paperclip button.