Adding to a graph of stock prices

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P_Alpha 2015-10-16

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https://ww2.mathworks.cn/matlabcentral/answers/249064-adding-to-a-graph-of-stock-prices

评论： P_Alpha 2015-10-17

Hi Everyone,

I have a graph with dates on the x axis and stock prices on the y axis. I have the closing price and moving average being plotted here. I have a variable with dates in col 1 and the change in the stock price in col 2. I would like to plot a circle on the the stock price line when the percent change is greater than .02. Any advice would be appreciated as I am at a complete loss. Best

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Answer 1

Image Analyst 2015-10-17

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https://ww2.mathworks.cn/matlabcentral/answers/249064-adding-to-a-graph-of-stock-prices#answer_196286

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To get the percent change in stock price, you need the stock price itself, not just the change in stock price. Assuming you have that and can get the dates and percent changes into 1-D vectors, you can do:

indexes = percentChanges > 0.02;
hold on;
plot(dates(indexes), percent(indexes), 'ro', 'MarkerSize', 16, 'LineWidth', 2);

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P_Alpha 2015-10-17

在 MATLAB Online 中打开

This kind of gets me what I am looking for. My issue now is that is screw with my axis limits, and I would like to plot them on the line "Stock Prices". My current plot of just stock prices is something along the lines of:

plot(pricedates,tickeradJclose,'-r')

I now also have have the logical that identifies when the price change is over .02 so I am not really sure how to get this to fall on onto my price line. Thanks so much for the help so far!

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