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diff --git a/fiz/vaje/9/.gitignore b/fiz/vaje/9/.gitignore
new file mode 100644
index 0000000..afed073
--- /dev/null
+++ b/fiz/vaje/9/.gitignore
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+*.csv
diff --git a/fiz/vaje/9/dokument.lyx b/fiz/vaje/9/dokument.lyx
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index 0000000..7cea21d
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+++ b/fiz/vaje/9/dokument.lyx
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+\begin_document
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+Preslikave s konveksno lečo
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+\begin_layout Author
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+Anton Luka Šijanec
+\end_layout
+
+\begin_layout Date
+12.
+ marec 2023
+\end_layout
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+\begin_layout Abstract
+Grafi in rezultati devete vaje pri predmetu 
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+F41
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+ na Gimnaziji Bežigrad v 4.
+ letniku.
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diff --git a/fiz/vaje/9/podatki.lyx b/fiz/vaje/9/podatki.lyx
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diff --git a/fiz/vaje/9/podatki.tsv b/fiz/vaje/9/podatki.tsv
new file mode 100644
index 0000000..8362056
--- /dev/null
+++ b/fiz/vaje/9/podatki.tsv
@@ -0,0 +1,6 @@
+a+b	b
+0.23	0.075
+0.25	0.075
+0.27	0.068
+0.29	0.065
+0.31	0.065
diff --git a/fiz/vaje/9/tab.py b/fiz/vaje/9/tab.py
new file mode 100755
index 0000000..0bc48c5
--- /dev/null
+++ b/fiz/vaje/9/tab.py
@@ -0,0 +1,14 @@
+#!/usr/bin/python3
+import pandas
+import sys
+import math
+b=pandas.read_csv("/dev/stdin", sep="\t")
+b.index.name = "idx"
+b["a"] = (b["a+b"]-b["b"])
+b["1/a"] = (1/b["a"])
+b["1/b"] = (1/b["b"])
+b["f"] = (1/(b["1/a"]+b["1/b"]))
+b["fodst"] = (abs(b["f"] - b.mean()["f"]))
+b = b.astype(float).round(6);
+b.to_csv("/dev/stdout", sep=sys.argv[1][0]);
+print(f"f = {b.mean()['f']} \pm {b.max()['fodst']} = {b.mean()['f']} (1 \pm {b.max()['fodst']/b.mean()['f']})", file=sys.stderr)