Sets Tab Functions


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set tab controls
  1. General Remarks About the Sets Tab
  2. Sets List
  3. Renumber Sets
  4. Assign Marks
  5. Delete Empty Sets
  6. Pick Set to Edit
  7. Set Visible
  8. Set Invisible
  9. Set Only
  10. Delete 1st Set
  11. Merge Sets
  12. Mark Appearance of Sets
  13. Set Type
  14. Change Set Name
  15. Append Member Names
  16. Blank Member Names
  17. Split Set
  18. Make Lwr Hem
  19. Flip Hem
  20. Rotate Pick
  21. Scan Line Weight
  22. Tilt 1
  23. Tilt 2
  24. Strain
  25. Intersection between Sets
  26. Intersection of Selected Sets

General Remarks About the Sets Tab

 Data points can be labelled as belonging to particular sets. Functions that manipulate data according to sets are found under the sets tabs.
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Sets List

 This is a list box, as with the data list and contour list, which shows the details of existing sets. Sets can be picked for processing by clicking on the box. Zero one or two sets may be selected.
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Renumber Sets

 This function renumbers the sets (and gives the new numbers to the data points)
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Assign Marks

This will assign marks to all sets automatically. It is a quick way to visually see which is in what set. Cauldron will choose a mark for each set regardless of which is chosen.
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Delete Empty Sets

 Deleting all the members of a set doesn’t cause the set to go away. This function rids you of sets with no contents.
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Pick Set to Edit

 An alternative method of selecting a set.
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Set Visible

 This function, obviously makes the entire (picked) set visible. It looks at each data member in turn and sets its 'visible' flag. Members of other sets may or may not be visible.
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Set Invisible

 This function, obviously makes the entire (picked) set invisible. It looks at each data member in turn and unsets its 'visible' flag. Members of other sets may or may not be visible.
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Set Only

This makes only the selected set visible and no other sets. It sets the visiblility flag of each data member according to whether or not it is in the 'picked' set.
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Delete 1st Set

 This Deletes set picked ( the first one if there is more than one).
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Merge Sets

 If two sets are selected, clicking this button will combine them into one set. Note this will not change the marks or colours used to represent the data.
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Mark Appearance of Sets

 Changes the marktype and colours used for a picked set based on the selection make under the enter tab.
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Set Type

 Resets the type of the currently picked set according to the type selected in the appropriate box under the 'enter' tab. For example, if one set contains poles to bedding planes, this function can be used to turn them into great circles.
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Change Set Name

 By typing a comment into the box adjacent to this button, and then clicking this button, the picked set's name (or 'comment' or 'memo') can be changed.
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Append Member Names

 This function appends the name (remark) of the set to the name (remark) of each of its members.
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Blank Member Names

 All member names are blanked (emptied) if a set is selected.
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Split Set

 If a small circle is picked (see edit tab), then this function will divide a set depending on whether it is inside or outside the selected small circle (one set becomes two).
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Flip Hemispheres

 Each data point in the selected set is flipped from lower to upper or from upper to lower hemispheres.
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Make Lower Hemispher

 Each data point in the selected set and the upper hemisphere (red) is moved into the lower hemisphere (black).
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Rotate Pick

 The intention of this function is to enable a set of data to be rotated around a pole, or to put it another way, to be tilted. To use this function you should pick a pole about which the rotation should occur. To do this, simply go to the 'edit' tab and select a data point. The returning to the 'sets' tab select the set to be rotated. Enter the angle for rotation in the adjacent box before clicking the 'Rotate Pick' button.
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Scan Line Weight

 This function removes one source of bias from sampling of planar data. Suppose that you obtained your data by measuring every joint along three straight sampling lines. The first task is to enter the direction of these three sampling lines (as points) but using their length as the weight/radius value. This must be entered in its own set. The second task is to enter the planar data in a separate set.

In the pick box on the sets tab select the scanline set and then select the data set. Next click on "scan line wt" and the result will be a copy of the data set with weights adjusted to take into account the scan lines. If, say, a joint is at a hig angle to each part of the scan line then it have a relatively high weight since it was a comparatively unlikely event that the scan line would encounter it. Using the weighted mean function, as opposed to the regular mean function will show the effect of the bias removed.
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Tilt 1

 This function is a variation on the 'rotate' function. Suppose there is a structure such as a bedding plane, that you believe once used to be horizontal (i.e. the pole was vertical). Suppose that you have a set containing structures (perhaps cross bedding) that were tilted at the same time as the bed. This function lets you tilt all the contents of the set (creating a new set) to remove the tilt of the selected bed. To use this function you must first select (edit tab) the structure whose dip is to be removed. Secondly you must select the set (set tab) to be processed.
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Tilt 2

 This function is a variation on the 'rotate' function and in turn, on the tilt1 tilt1 function. In tilt 2 you must select 2 data in the edit menu pick box. The difference in inclination of these two planes will define the rotation applied to a picked set. If unconformities are taken to be horizontal at the time of their creation, then it is sometimes possible to identify several episodes of tilting. This function enables them to be removed one at a time.
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Strain

 'Strain' applies pure shear to a selected set in a direction given by a selected point (the 'axis'). The amount of strain and its sense is given by a numerical value entered in the adjacent box (also used for rotation). A value of 1 makes no change, values less than 1 gives shortening on the axis. Values greater than 1 elongation. Importantly poles are treated differently from points. Compression along the axis causes structures to rotate towards a direction normal to the axis. This makes poles to planes go the other way. Internally a strain (extension value) of 0.5 is treated as a value of 2 (=1/0.5) for poles and planes.
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Intersection between Sets

 If two sets are selected then this function will create a third set that contians the intersections (mutual normals to poles) between of the two sets. If for example a set containing bedding data for 35 beds id chosen and a set containing cleavage data with 12 data items then the resulting set will contain 35 x 12 = 420 possible directions for cleavage-bedding lineations.
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Intersection of Selected Set

 If a set is selected then chosing this option will create a new set containing all the intersections between members of theselected set. If a set of 6 joints are used then the resulting set will contain the (6-1) x (6-2) =20 poles which represent the intersection between the joint - perhaps pottential wedge failure directions.
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Copyright: The copyright (2001) of this page is owned by Dr Nigel Stuart of Resource Dynamics, Alberta, Canada. You are welcome to use, reproduce it in part or in whole. Should you reproduce it in part please ensure that credit/blame for authorship is given. A link to the Resource Dynamics home page would be appreciated.