Curve plotting, Vertical rulers, Stem density. Trend/CC along a curve. The CC function.

Last update: Nov 30 2019
Plotting ring width curves with old time towards left and later time towards right
The default way of plotting in CDendro was previously with late time to the left and older times towards right. This is not the conventional way of presenting the time scale. If you need a curve plotted the conventional way, you may uncheck the "Plot curves with old times towards right" checkbox as shown above.
With a suitable setting of some other display options you can get a curve which matches e.g. an old published curve, as shown above with a curve of Ernst Hollstein. This way you can check your reading-in of a printed curve as above or create a suitable curve for a lecture.

You should be aware that CDendro is not basically written to handle the curves plotted this way. E.g. intervals are always specified with late time first (leftmost value) and old time next (rightmost value). See e.g. the "Look at blocks..." frame on a "Curve display" window.

  • The stroke weight (thickness) of the red curve can be adjusted through the menu command Settings/Plotting window settings/Red curve stroke weight.

To make curve diagrams easier to see, the stroke weight (curve line thickness) of the sample curves can now be made wider than only one pixel as set before. The setting can be adjusted through the menu command "Settings/Plotting window settings/Red curve stroke weight". The red and green curve lines above are two pixels wide.

Set vertical rulers to mark years of special interest

When the "Vertical rulers" checkbox is checked a vertical ruler will follow your cursor along the curve diagram (see ruler marked 1935 above).

Use ctrl-click to set (anchor) a vertical ruler across your curves (marked 1940 and 1959 above). The rulers are by default anchored in the current sample.

When the "Anchor in reference" checkbox is checked, the ruler will be anchored in the reference.
It will then also show up in the window of the reference if the "Anchor in reference" checkbox is checked also in that window.

You will see the difference between the anchoring modes when you shift your current curve in relation to the reference.
Rulers anchored in the current curve (sample) will stay with that curve, rulers anchored in the reference will stay with the reference curve.

To remove a ruler, ctrl-click on it!
Right-click on the Vertical rulers checkbox to remove all vertical rulers anchored in the current sample window.

When a vertical ruler is set within a sample but anchored into the reference, then rulers are automatically made visible within the reference window.
Vertical rulers checkbox now automatically checked when a sample opens and the reference sample already has vertical rulers visible.
Also when you check "anchor in reference", the Vertical rulers checkbox is automatically checked.
Stem density
The stem density of a collection's mean value sample is now shown at the top of the curve window for a sample and at the bottom for the reference.

This feature can be deselected by unchecking Settings/Plotting window settings/Show number of stems behind your collection mean value curve.

Successive segment/block correlation values
Correlation coefficient values of successive blocks/segments are now shown at the bottom of the curve diagram.

Block length and distance can be set through the text boxes at the lower left corner below the diagrams. Blocks may overlap.

CC and TT calculations to support your visual crossdating

Also the TT-value is now displayed with the CorrC value!

Plotting a large ring width curve - Adjusting horizontal scale by zooming
Ring width curves can plotted larger (higher) than before. This is useful when creating curves for reports or other documentation.

Horizontal curve scale can be adjusted in small steps by clicking the zoomin and zoomout icons (magnifier glass) with the RIGHT-button of the mouse. This is useful when comparing with a published curve shown in another application window when each window do not fill the whole screen, but they can be seen simultaneously.

  • "Same-Trend bar" based on Gleichläufigkeit between reference and a sample can be plotted along the green ring width curve.
There is now a "Same Trend-bar" available for those who want to see how the trend (Gleichläufigkeit) varies along two curves being compared. The Same Trend bar can be turned on or off through a checkbox under the curves diagram. The default setting (same-trend or no same-trend bar) can be controlled by the checkbox Settings/Plotting window settings/Show same trend by default.
Remove reference curve from diagram: Use "Set no reference selected"
There a cases when you want to remove the reference curves from your curve diagram. Then use the menu command above!

Clicking on the curve...

Click in the curve diagram to get ring width information about that year displayed in the big white box below the curves.
Ctrl-click to insert or remove a vertical ruler.
Right-click to insert a zero ring.
Shift-right-click to remove a zero ring.
Shift-right-click to remove even an existing ring! (not for .pos files)

Crossdating quality test diagrams: The CC function as a curve or piled

Crossdating quality test functions The correlation coefficient (or T-value) for all possible crossdating positions can be plotted as a curve or as a piled (narrow columns) diagram, see above.

Note: The Crossdating quality test functions frame/order panel then has to be enabled through Settings/Enable crossdating quality test functions.

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