This function allows the user to plot the graph of x against y, along with both x and y errorbars.
For the x and y errors it is possible to input both lower (lx and ly) and upper (ux and uy) values for the errors at a particular point. If the upper values are not specified then the program assumes the errors are symmetrical and use the lower values. it is also possible to specify the plot line colour, marker, and linestyle using the standard 'plot' command notation in the input variable 'linecol'. Also the line colour for the errobars can be specified in the variable 'errorcol'. It is important to note that if these colour options are to be used and any of the error limit vectors are empty then they should not be excluded, but presented in a  form signifying an empty vector.
James Rooney, 17 October 2003
James Rooney (2021). errorbarxy (https://www.mathworks.com/matlabcentral/fileexchange/4065-errorbarxy), MATLAB Central File Exchange. Retrieved .
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