upd

README.md

@@ -373,6 +373,20 @@ produces:
 
 ![upset plot of 10 sketches intersections](examples/10sketches.upset.png)
 
+### `venn` - plot 2- or 3-way sketch intersections using Venn diagrams
+
+Plot a Venn diagram of the intersections between two or three sketches.
+
+This command:
+```
+sourmash scripts venn sketches/{2,47,63}.sig.zip \
+    -o 3sketches.venn.png
+```
+
+produces:
+
+![venn diagram of 3 sketches intersections](examples/3sketches.venn.png)
+
 ## Support
 
 We suggest filing issues in [the main sourmash issue tracker](https://github.com/dib-lab/sourmash/issues) as that receives more attention!

examples/Snakefile

@@ -15,6 +15,7 @@ rule all:
         "10sketches.upset.png",
         "tsne.64sketches.cmp.png",
         "tsne2.64sketches.cmp.png",
+        "3sketches.venn.png",
 
 rule cmp_3sketches:
     input:
@@ -253,3 +254,13 @@ rule upset_10sketches:
     shell: """
         sourmash scripts upset {input.sigs} -o {output.fig}
     """
+
+rule venn_3sketches:
+    input:
+        expand("sketches/{n}.sig.zip", n=sketches_3)
+    output:
+        png="3sketches.venn.png",
+    shell: """
+        sourmash scripts venn {input} -o {output}
+    """
+