Plotting data as a function of time

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jacob Mitch 2019-10-13

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评论： jacob Mitch 2019-10-14

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

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Stephan 2019-10-13

you are right, whats the question?

jacob Mitch 2019-10-14

编辑：jacob Mitch 2019-10-14

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

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Answer 1

dpb 2019-10-13

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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.

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jacob Mitch 2019-10-14

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

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