@f{xyinterpol}

Displays the interpolated y-coordinate for a given x-coordinate or the x-coordinate for a given y-coordinate of a 1D or 2D dataset.

@f{xyinterpol(datasetname, Value)}

@f{xyinterpol(dataset, Value, format)}

@f{xyinterpol(dataset, Value, format, i_intersect)}

@f{xyinterpol(dataset, Value, format, i_intersect, default_return)}

Parameters

Parameter

dataset

Specifies the 1D or 2D dataset. Can be one of the following values:

Value	Description
Dataset name	Is the name of the dataset, e.g. Data1.
Index of the dataset	Is the index. The first dataset in the layer has the index 1.
Layer name:Index of the dataset	If the layer name is given, the field function can be in a text object owned by a differen layer, e.g. Diagram1:1.

Value

Is the value of a coordinate. The value can start with x= or y=. Default is x=. This parameter supports nested field function as show below. The nested field function should be called without the ‘@f{}’. In the following example we find the x-position of the maximum of y for Data2, and compute the value of Data1 at this x position.

@f{xyinterpol(Data1,x=xystatvalue(Data2, ymaxpos))}

format

Specifies the number format. The default format is %g. Example: %.3lf will print the values with 3 decimal places. For a complete description see printf. In field functions commas are not allowed inside the format string.

i_intersect

If more than one intersection exists with the dataset, the index of the intersection can be specified. Negative values count from the end. Default value is 1.

default_return

Sets the default return value, if the dataset has no intersection or the dataset is not found. Default value is ----.

Example

Example 1

@f{xyinterpol(Data1, y=54.21)}

Power at 2100 rpm: @f{xyinterpol(Data1, x=2100, %.2lf kW)}

Power at 2100 rpm: @f{xyinterpol(Diagram1:1, 2100, %.2lf kW, 1)}

Output 1:

2100

Power at 2100 rpm: 54.21 kW

Power at 2100 rpm: 54.21 kW

Example 2

X postion of Ymax of Data2 (@l{1.2,0,8,255,0,0}) --> @f{xystatvalue(Data2, ymaxpos,%.1f)}s

Y value of Data1 (@l{1.2,0,8,0,0,255}) at @f{xystatvalue(Data2, ymaxpos,%.1f)}s --> @f{xyinterpol(Data1,x=xystatvalue(Data2, ymaxpos),%.1f)} N.m

.

Output 2

History

Version	Description
R2025.2	Value parameter supports nested field function.
R2022.4	The ‘x=’ now works even if x-axis is not time based. The “y=” request also works.
R2012.13	Error in parameter i_intersect fixed.
5.15.0	New.

See also

Overview Field Functions, Edit=>Update Fields, Diagram=>Insert Field Function, DT_Format, printf, @f{xyvalue}

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