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move png to Imports field

Zuguang Gu authored on 29/03/2019 08:28:36
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@@ -7,9 +7,9 @@ Author: Zuguang Gu
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 Maintainer: Zuguang Gu <z.gu@dkfz.de>
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 Depends: R (>= 3.1.2), methods, grid, graphics, stats, grDevices
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 Imports: circlize (>= 0.4.5), GetoptLong, colorspace, clue,
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-    RColorBrewer, GlobalOptions (>= 0.1.0), parallel
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+    RColorBrewer, GlobalOptions (>= 0.1.0), parallel, png
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 Suggests: testthat (>= 1.0.0), knitr, markdown, dendsort, 
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-    Cairo, png, jpeg, tiff, fastcluster,
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+    Cairo, jpeg, tiff, fastcluster,
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     dendextend (>= 1.0.1), grImport, grImport2, glue,
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     GenomicRanges
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 VignetteBuilder: knitr
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@@ -257,6 +257,7 @@ import(graphics)
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 import(grid)
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 import(methods)
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 import(stats)
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+import(png)
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 importFrom("GetoptLong", qq)
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 importFrom("GetoptLong", qq.options)
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 importFrom("GetoptLong", qqcat)