擅长:python、mysql、java
<pre><code>library(dplyr); library(stringr)
df %>% mutate(diff = str_remove(column2, column1))
index column1 column2 diff
1 1 Admission Date Residence - Location Residence - Location
2 2 Malnutrition Malnutrition-12 -12
3 3 TB NAN NAN
4 4 Anaemia <NA> <NA>
</code></pre>
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<p>编辑:相同w/o <code>dplyr</code></p>
<pre><code>df$diff = stringr::str_remove(df$column2, df$column1)
</code></pre>
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