Line plot with two different color based on the condition of the value
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I have a array of 731 numbers. Some have value greater than 0 and some have value less than 0. I want to draw a plot based on the condition, if the value is greater than 0 the color of the line will be red and if the value is less than 0 the color of the line will be green. I have attached the .mat file.Thank you
One way is to use index vectors. But you may not want the points connected by lines that cross subsets of the other color. If you really want the line you would need to do some more processing of this output, maybe a for loop that plots red and then green groups. This example below shows how to get the index vectors and then plot the data points with no lines.
>> t = 0:0.01:5;
>> x = 2*sin(2*pi*50/33*t);
>> Ired = x >= 0;
>> Igreen = x < 0;
>> figure, plot(t(Ired), x(Ired), 'ro', t(Igreen), x(Igreen), 'gx');
Try to use this example to produce the results you want. If you have further problems then ask a specific question and post your data and sample code. As I suggested, a for loop is probably needed to plot groups of red and green data sets one by one.
One way to quickly identify the red/green changes is with another index vector:
Ichange = diff(Ired) ~= 0;