Can I create a custom markersize for plotting?

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Sean Farrell
Sean Farrell 2017-1-14
评论： tuo 2020-4-23
Hi everyone. I am working on plotting a distribution of points. I need to plot custom sized points, however. Specifically, I have an image that I uploaded into MatLab, and on the image, there is a scale which represents 200 nanometers. From this scale and the imtool function, I can find how many pixels are in the 200 nanometers. With more calculations (I won't mention them), I can find how many pixels are in a particle that is 15 nanometers, in my case 7 pixels! Now, I want to plot these particles onto the image, with the corresponding diameter in pixels. So, instead of just doing ('MarkerSize',10), can I somehow plot points with a specified dimension?
Much appreciated!

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回答（1 个）

Walter Roberson
Walter Roberson 2017-1-14
If you are drawing lines, then you can only have one marker size for any given line object. The marker size is in points.
If you use scatter() then you can provide a vector of sizes, so as to give a different size for each marker. The marker size is in points. The documentation for scatter specifically indicates that it is the area that you give, so if you want a particular diameter, d, use pi*(d/2)^2

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