Why do I receive "Index in position 2 exceeds array bounds (must not exceed 1)" error?

% Setup the Import Options and import the data

opts = spreadsheetImportOptions("NumVariables", 3);

% Specify sheet and range

opts.Sheet = "Sheet1";

opts.DataRange = "A2:C170641";

% Specify column names and types

opts.VariableNames = ["Instrument", "TimeofDayhrs", "LaeqdBA"];

opts.VariableTypes = ["categorical", "double", "double"];

% Specify variable properties

opts = setvaropts(opts, "Instrument", "EmptyFieldRule", "auto");

% Import the data

AcftNoiseData = readtable("/Applications/StirlingMATLAB/AcftNoiseData.xlsx", opts, "UseExcel", false);

% Clear temporary variables

clear opts

%Initialize Variables

instrument=AcftNoiseData.Instrument;

time=AcftNoiseData.TimeofDayhrs;

Laeq=AcftNoiseData.LaeqdBA;

%Plotting LAeq Noise Levels

x=time;

y=Laeq;

subplot(2,1,1)

plot(x(1,1:85320),y(1,1:85320));

grid

subplot(2,1,2)

plot(x(1,85321:170640),y(1,85321:170640));

grid

***Index in position 2 exceeds array bounds (must not exceed 1).

Error in AircraftNoiseData (line 39)

plot(x(1,1:85320),y(1,1:85320));

I am trying to divide my data into two plots, each containing the data for a resepctive instrument type, which changes from one to the other at index 85320. I thought I was able to do what I did with my subplot and plot codes, but clearly can't. IF anyone knows my issue I would love help. Apologies if this is a stupid question. Thank you!

[DGM]

The error suggests that the second dimension of x or y is 1. So what are the sizes of x and y?

[Stirling Ellis]

You saying this made me realize my mistake. They’re each 170640x1, not 1x170640. Thank you so much!