How do we plot a red dot (to represent a trade) on a financial candlestick chart?

I am plotting a financial candlestick chart using this MATLAB function:

How do I plot a red dot on the chart, to represent a trade at that point?


For the point you want to add, you would need its position on the y-axis yValue and the date where it is to be placed on the x-axis xValue (formatted as a single serial date number). Then the following should work:

candle(...);  %# Make your candle plot
hold on;      %# Add to the existing plot
plot(xValue,yValue,'r.');  %# Plot a red dot

If you want a larger red dot, you can replace the last line with either of the following:


Need Your Help

Python: Identifying a numeric string?

python regex coercion

I tried a couple of approaches, I am really only concerned with performance, not correctness. I noticed that the regex based implementation is about 3-4x slower than the one that uses type coercion...