How to search for numbers/strings in a column and populate numbers accordingly in a different column?

Question

I’m annotating keystroke logging data (in Excel) where I need to create a trial number (Trial column) for each logged key (Input column), depending on the number logged at the beginning of each line (after RETURN key). As shown in the table below, for the line "10. red" the trial number for each key should be 10.

Could anyone suggest a way to fill out the Trial column automatically? Even if it’s not 100% accurate, it will save me a lot of time. Thanks in advance!!

Input	Trial
RETURN	9
1	10
0	10
.	10
r	10
e	10
d	10
RETURN	10
1	11
1	11
.	11
b	11
l	11
u	11
e	11
RETURN	11
1	12
2	12

I imagine python could help but I don’t know what functions exactly.

Asked By: Hui.S

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Source

Answer 1

import pandas as pd

s = 'InputtTrialnRETURNt9n1t10n0t10n.t10nrt10net10ndt10nRETURNt10n1t11n1t11n.t11nbt11nlt11nut11net11nRETURNt11n1t12n2t12'
data = [r.split('t')[0] for r in s.split('n')[1:]]
df = pd.DataFrame(data, columns=['Input'])
start_trial = 9
df['Trial'] = start_trial
df.loc[1:, 'Trial'] += ((df.Input == 'RETURN').cumsum())[1:]
print(df)

prints

     Input  Trial
0   RETURN      9
1        1     10
2        0     10
3        .     10
4        r     10
5        e     10
6        d     10
7   RETURN     11
8        1     11
9        1     11
10       .     11
11       b     11
12       l     11
13       u     11
14       e     11
15  RETURN     12
16       1     12
17       2     12

Answered By: Michael Hodel

Answer 2

With base R:

dt <- structure(list(V1 = c("RETURN", "1", "0", ".", "r", "e", "d", 
                            "RETURN", "1", "1", ".", "b", "l", "u", "e", "RETURN", "1", "2"
), V2 = c(9L, 10L, 10L, 10L, 10L, 10L, 10L, 10L, 11L, 11L, 11L, 
          11L, 11L, 11L, 11L, 11L, 12L, 12L)), class = "data.frame", row.names = c(NA, 
                                                                                   -18L))

dt$V3 <- 9 + cumsum(dt$V1 == "RETURN") - as.numeric(dt$V1 == "RETURN")
dt
#>        V1 V2 V3
#> 1  RETURN  9  9
#> 2       1 10 10
#> 3       0 10 10
#> 4       . 10 10
#> 5       r 10 10
#> 6       e 10 10
#> 7       d 10 10
#> 8  RETURN 10 10
#> 9       1 11 11
#> 10      1 11 11
#> 11      . 11 11
#> 12      b 11 11
#> 13      l 11 11
#> 14      u 11 11
#> 15      e 11 11
#> 16 RETURN 11 11
#> 17      1 12 12
#> 18      2 12 12

^{Created on 2023-05-18 with reprex v2.0.2}

In Excel use IF below your first line:

Answered By: M Aurélio

How to search for numbers/strings in a column and populate numbers accordingly in a different column?

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