How to calculate the derivatives at each data point?

Hi Konstantinos

Not exactly derivative but

diff(df[,2])

[1] -0.01 -0.01 -0.01 -0.01  0.00  0.01 -0.02 -0.03 -0.02

May be enaough for you.

Cheers
Petr

-----Original Message-----
From: R-help <r-help-bounces at r-project.org> On Behalf Of konstantinos
christodoulou
Sent: Tuesday, January 31, 2023 10:16 AM
To: r-help mailing list <r-help at r-project.org>
Subject: [R] How to calculate the derivatives at each data point?

Hi everyone,

I have a vector with atmospheric measurements (x-axis) that is
obtained/calculated at different altitudes (y-axis). The altitude is

uniformly

distributed every 7 meters.
For example my dataframe is:
df <- dataframe(
*altitude* = c(1005, 1012, 1019, 1026, 1033, 1040, 1047, 1054, 1061,

1068),

*atm_values* = c(1.41, 1.40, 1.39, 1.38, 1.37, 1.37, 1.38, 1.36, 1.33,

1.31)

                         )

How can I find the derivatives of the atmospheric measurements at each
altitude?

I look forward to hearing from you!

Thanks,
Kostas

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