Convert numeric data for use with specific ruler


data = num2ruler(num,ruler)



data = num2ruler(num,ruler) converts the numeric values in num to the appropriate values for the specified ruler. The resulting values depend on both the type and limits of the ruler input. The output data is an array the same size as num.


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Convert the output of ginput from a numeric value to the equivalent date value.

Create a plot with dates along the x-axis. Then, click a point in the axes and use the ginput function to return the location of the selected point.

t = datetime(2015,1,1:10);
y = rand(10,1);
ax = gca;
[x,y] = ginput(1)

x =


y =


The ginput function returns the location as numeric values. Use num2ruler to determine the date value that is equivalent to the numeric value returned for x.

xdate = num2ruler(x,ax.XAxis)
xdate = 

   06-Jan-2015 19:36:13

Input Arguments

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Numeric data, specified as an array.

Example: num = [1 2 3]

Ruler that determines data mapping, specified as one of these types of ruler objects:

  • DurationRuler object — Convert the input num to duration values.

  • DatetimeRuler object — Convert the input num to datetime values.

  • NumericRuler object — No conversion. For this case, the output data is equal to the input num.

Specify the ruler object by referring to either the XAxis, YAxis, or ZAxis property of the Axes object.

ax = gca;
data = num2ruler(num,ax.XAxis)

Introduced in R2016b