Multi-colored bar charts: example 6
Pattern-filled bar charts: example 7
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Data files for some examples
bar_1.ncl:
Bar chart examples. The first frame just sets gsnXYBarChart to True, which causes each Y value
to be represented by a bar pointing upward. The base of each bar is the
minimum Y value or the value of trYMinF, if set.
bar_2.ncl:
Demonstrates coloring values above and below a reference line with a
particular color.
bar_3.ncl:
Demonstrates changing the size of the bars.
bar_4.ncl:
Demonstrates turning off bar outline around each bar. This is useful
when you have a lot of data points because the outline is drawn after
the color fill, and a black line and can obscure it.
bar_6.ncl:
Demonstrates how to make individual bars different colors within a bar
chart that has a reference line. The colors can be chosen separately
for the above and below bars (first plot), or sequentially regardless
of orientation (second plot).
bar_7.ncl:
A bar chart w/o a reference line, and individual colors. The second
frame adds a labelbar.
bar_8.ncl:
Demonstrates how to make individual bars different colors and
patterns within a bar chart that has a reference line. Colors are
distributed separately for bars above and below the reference line
(first plot), or regardless of orientation of the bars (second plot).
bar_9.ncl:
This script creates a single bar chart showing 4 different timeseries
with four different colors. The labelbar is created by using gsn_labelbar_ndc.
polyg_10.ncl:
This example shows how to draw various polylines and polygons on a
several generic tickmark backgrounds to create a series of bar
charts. The gsn_add_polyline and
gsn_add_polygon functions are used
to create the polylines and polygons and gsn_panel is used to panel all the plots on
one frame.
bar_11.ncl: This script shows how to
panel multiple bar charts and add a custom legend (using labelbars).
Example pages containing: tidbits | resources | functions/procedures
Bar Charts
Bar charts in this context are simply XY plots that are drawn with
bars for each X,Y point. There is a separate page for
creating histograms.
bar_1.ncl:
Bar chart examples. The first frame just sets gsnXYBarChart to True, which causes each Y value
to be represented by a bar pointing upward. The base of each bar is the
minimum Y value or the value of trYMinF, if set.
The second frame additionally sets gsnXYBarChartOutlineOnly to True, which causes each Y value to be represented by a horizontal bar, creating an outline plot. There are no individual bars drawn here.
The third frame sets gsnYRefLine to 0, causing all the positive Y values to be drawn as bars pointing upward, and all negative Y values to be drawn as bars pointing downward.
bar_2.ncl:
Demonstrates coloring values above and below a reference line with a
particular color.
gsnAboveYRefLineColor = "red", and gsnBelowYRefLineColor = "blue", are the two resources required to shade the bars above and below the reference line.
bar_3.ncl:
Demonstrates changing the size of the bars.
By default, the thickness of each bar is delta-x. You can make the bars smaller than this by setting gsnXYBarChartBarWidth to a smaller number. In this instance, delta-x is 0.66 and we have changed the width to 0.1. Note that at this point it becomes hard to see the bar colors, because the bars are pretty thin.
bar_4.ncl:
Demonstrates turning off bar outline around each bar. This is useful
when you have a lot of data points because the outline is drawn after
the color fill, and a black line and can obscure it.
xyLineColors = (/"red","blue"/), changes the outline color for the above and below color filled areas respectively.
bar_6.ncl:
Demonstrates how to make individual bars different colors within a bar
chart that has a reference line. The colors can be chosen separately
for the above and below bars (first plot), or sequentially regardless
of orientation (second plot).
gsnAboveYRefLineBarColors controls the colors of the bars above the reference line. This is an array. The colors will repeat. gsnBelowYRefLineBarColors controls the colors below the reference line.
gsnXYBarChartColors2 will assign a sequence of colors regardless of bar orientation.
bar_7.ncl:
A bar chart w/o a reference line, and individual colors. The second
frame adds a labelbar.
gsnXYBarChartColors controls the colors of the bars.
bar_8.ncl:
Demonstrates how to make individual bars different colors and
patterns within a bar chart that has a reference line. Colors are
distributed separately for bars above and below the reference line
(first plot), or regardless of orientation of the bars (second plot).
gsnAboveYRefLineBarPatterns controls the patterns of the bars above the reference line. This is an array. The patterns will repeat. gsnBelowYRefLineBarPatterns controls the patterns below the reference line.
gsnXYBarChartPatterns2 will apply the patterns regardless of the orientation of the bars.
There are several patterns to choose from.
bar_9.ncl:
This script creates a single bar chart showing 4 different timeseries
with four different colors. The labelbar is created by using gsn_labelbar_ndc.
polyg_10.ncl:
This example shows how to draw various polylines and polygons on a
several generic tickmark backgrounds to create a series of bar
charts. The gsn_add_polyline and
gsn_add_polygon functions are used
to create the polylines and polygons and gsn_panel is used to panel all the plots on
one frame.
bar_11.ncl: This script shows how to
panel multiple bar charts and add a custom legend (using labelbars).
This example is similar to example 9 above, except it uses the overlay procedure to overlay the individual bar plots. Finally, it uses gsn_panel to panel the four sets of plots.