Error using plot Invalid subscript for Y.

I imported data using import data funtion and want plot FO2_Odometer vs 1st sensor ,I keep getting this error please help me

[Rik]

You're trying to plot a table datatype. What data is actually inside that table?

[Utsav Lakhlani]

it contain numbers

[Rik]

Casting to double might be enough. If you had posted your code as code instead of a screenshot I would have done that for you.

[Utsav Lakhlani]

%% Import data from text file
% Script for importing data from the following text file:
%
%    filename: C:\Users\utsav\OneDrive\Desktop\TIP\Data_set0.csv
%
% Auto-generated by MATLAB on 09-May-2022 15:48:25

%% Set up the Import Options and import the data
opts = delimitedTextImportOptions("NumVariables", 43);

% Specify range and delimiter
opts.DataLines = [3, Inf];
opts.Delimiter = ",";

% Specify column names and types
opts.VariableNames = ["Date", "Time", "Odometer1", "Odometer2", "speed1", "speed2", "impulse", "AccX", "AccY", "AccZ", "PT100", "sys_temp", "DP", "Pressure", "Pitch", "Roll", "FO2_Odometer", "FO2_Speed", "status", "Caliper1", "Caliper2", "Caliper3", "Caliper4", "Caliper5", "Caliper6", "Caliper7", "Caliper8", "Caliper9", "Caliper10", "Caliper11", "Caliper12", "Caliper13", "Caliper14", "Caliper15", "Caliper16", "ID1", "ID2", "ID3", "ID4", "ID5", "ID6", "ID7", "ID8"];
opts.VariableTypes = ["datetime", "datetime", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double", "double"];

% Specify file level properties
opts.ExtraColumnsRule = "ignore";
opts.EmptyLineRule = "read";

% Specify variable properties
opts = setvaropts(opts, "Date", "InputFormat", "dd/MM/yyyy");
opts = setvaropts(opts, "Time", "InputFormat", "HH:mm:ss");
opts = setvaropts(opts, "status", "TrimNonNumeric", true);
opts = setvaropts(opts, "status", "ThousandsSeparator", ",");

% Import the data
Dataset0 = readtable("C:\Users\utsav\OneDrive\Desktop\TIP\Data_set0.csv", opts);


%% Clear temporary variables
clear opts

sensors = Dataset0(:,20:35);
FO2_Odometer = Dataset0(:,17);
plot(FO2_Odometer,sensors(:,1))

Answer 1

[Rik]

Let's generate some data and try my suggestion of casting to double:

%generate data
FO2_Odometer=rand(10,1);Caliper1=rand(10,1);Caliper2=rand(10,1);Caliper3=rand(10,1);
Dataset0=table(FO2_Odometer,Caliper1, Caliper2, Caliper3)

Dataset0 = 10×4 table
    FO2_Odometer    Caliper1    Caliper2    Caliper3
    ____________    ________    ________    ________

       0.69186       0.51453     0.51247    0.87264 
       0.87827       0.78237     0.81322    0.30298 
       0.24861       0.70964     0.65119    0.58141 
      0.032346      0.096039     0.11605    0.40892 
       0.27076      0.014997    0.003108    0.75369 
      0.067883       0.45315     0.18844    0.39127 
       0.49965       0.77489     0.74358    0.78742 
       0.52503       0.93181     0.83883    0.68599 
       0.82869       0.99609    0.031551    0.20222 
       0.62017       0.69801     0.79995    0.20609 

% extract the data and try casting to double
sensors = Dataset0(:,2:4);
FO2_Odometer = Dataset0(:,1);
try
    double(FO2_Odometer)
catch ME,fprintf('Error using tabular/double\n%s\n',ME.message),end

Error using tabular/double
Undefined function 'double' for input arguments of type 'table'. To convert to numeric, use the TABLE2ARRAY function, or extract data using dot or brace subscripting.

Oops. An error. Luckily, it provides a suggestion to extract the data.

Since the error message suggests this, let's try it:

FO2_Odometer=table2array(FO2_Odometer);
sensors=table2array(sensors);
plot(FO2_Odometer,sensors(:,1),'*')

[Utsav Lakhlani]

Thankyou very much .