# Plotting data as a function of time

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jacob Mitch on 13 Oct 2019
Commented: jacob Mitch on 14 Oct 2019
I'm just trying to understand plotting prices as a function of time, if I have price data of prices in a column, say x=[1;2;3;4;5;6;7;8;9;13;14;15] and creating a time axis of integers from 1 to the number of days so 1:length of the first colum am I correcting in the definition of plotting the prices as a function of time by.
numberofdays=size(x,1)
plot(1:numberdays,x(:,1)) %equivalent to plot(t,y) where x(:,1) are the first column price values

Stephan on 13 Oct 2019
you are right, whats the question?
jacob Mitch on 14 Oct 2019
The question says to create an array containing the integers from 1 to numberofdays and then use this as a time axis. The question then says plot prices as a function of time. I got prices from a table of data, as the first column x(:,1). Thanks again

dpb on 13 Oct 2019
For the given description, yes. BUT, you should probably create your date vector as one of the datetime or duration class instead as just integers if there is anything excepting just arbitrary day sequence number in the time series. Most often, one only has economic data that is associated with an actual date.

#### 1 Comment

jacob Mitch on 14 Oct 2019
The question says to create an array containing the integers from 1 to numberofdays and then use this as a time axis. The question then says plot prices as a function of time. I got prices from a table of data, as the first column x(:,1). Thanks again