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Hi All,

I have some financial data price and time.

I need to plot it on a chart, however, i want the Y axis to be a log scale and the x axis to be a log scale

so both need to be log scaled.

How can i do this?

Adam Danz
on 14 Sep 2020

Edited: Adam Danz
on 14 Sep 2020

Convert the dates to duration from the starting date but use the numeric form of the durations (ie, not the "duration' class). Then you're just working with regular old numbers that can sustain the log scale.

If you want to see the date for each point, add the dates to the datatips.

Demo:

% Create date-time vector and data

dt = datetime(2020,1,1) + days(0:5:365);

data = exp(1:numel(dt));

% Compute number of days since the start of dt.

ndays = days(dt - dt(1));

% Plot data and show starting date in xlabel

h = loglog(ndays,data, 'o');

xlabel(sprintf('Number of days since %s',datestr(dt(1))))

% Now add the dates to each marker in their datatip.

h.DataTipTemplate.DataTipRows(end+1) = dataTipTextRow('Date',dt);

X is the number of days since the first datetime value.

Date shows the datatime value for each data point.

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