Curve Fitting: Export Tab

This Tab sets options for exporting the X,Y points series belonging to the curve.

The X Point Range to be generated will depend on the X Coordinate Pixel Interval set.

Points are always generated from the smaller X coordinate value to the bigger one, taken from the original points series generated by the user when clicking on the image.

The default interval is 1, if other Pixel Interval is set  (in the image to the left the interval is 5), only a subset of those points will be generated.
If the interval is 2 only half the points will be generated, if it is 5, only one point in five will be saved.

Let's imagine an hypothetical set of points with the following coordinates values (in pixels):

X Y
23 58
35 62
38 67
55 30

If the Conversion factor is 1.5 the points will get the following values:

X Y
34.50 87.00
52.50 93.00
57.00 100.50
82.50 45.00

Setting a X Coordinate Pixel Interval

The interval set will determine how many points are generated. If interval is 1, then one point will be generated for each value between the first and the last X values.

Following the above example, when the curve is calculated, points with X values from the 23 to 55 pixels range will be generated, that means that 33 points will be generated (if the X interval is 1). The points values will be adjusted using the Conversion Factor, so the final X range will go from 34.50 to 82.50.
Since Y values are calculated from X values, Y is only indirectly affected by the chosen interval.

Now, if the interval is, as shown in the above image, it  will be applied to the original pixel values, so the first X point still will be equal to 23, but the second one will be 28, the third one 33, and so on. As usual, the Conversion Factor will be applied, so the final range of generated points will be:

X Pixel value
X value after conversion
23
34.50
28
42.00
33
49.50
38
57.00
43
64.50
48
72.00
53
79.50
55
82.50

As the above table shows the final X interval will be equal to the specified Pixel Interval value multiplied by the Conversion Factor.

The interval between the last two X values may be less than the Pixel Interval set, because the last X value is always included in the range.

Saving the Points series  

Points can be saved as CSV or ASCII. Learn more .

Click Browse to select the file name where you want to save the set of points or select any previously use file name by clicking the list box.
If Open file automatically is selected the file will be opened, usually by Excel or Notepad, depending on the chosen format.