# [R] How to create a new data.frame based on calculation of subsets of an existing data.frame

Ioannou, Ioanna |o@nn@@|o@nnou @end|ng |rom uc|@@c@uk
Tue Dec 17 18:59:55 CET 2019

```Hello everyone,

I have the following problem: I have a data.frame with multiple fields.

If I had to do my calculations for a given combination of IM.type and Taxonomy is the following:
names(D)

VC <- 0.01*( subset(D, IM.type == 'PGA' & Damage.state == 'DS1' & Taxonomy == 'ER+ETR_H1')[10:13] -
subset(D, IM.type == 'PGA' & Damage.state == 'DS2' & Taxonomy == 'ER+ETR_H1')[10:13])  +
0.02*(     subset(D, IM.type == 'PGA' & Damage.state == 'DS2' & Taxonomy == 'ER+ETR_H1')[10:13] -
subset(D, IM.type == 'PGA' & Damage.state == 'DS3' & Taxonomy == 'ER+ETR_H1')[10:13])  +
0.43*( subset(D, IM.type == 'PGA' & Damage.state == 'DS3' & Taxonomy == 'ER+ETR_H1')[10:13] -
subset(D, IM.type == 'PGA' & Damage.state == 'DS4' & Taxonomy == 'ER+ETR_H1')[10:13])  +
1.0*( subset(D, IM.type == 'PGA' & Damage.state == 'DS4' & Taxonomy == 'ER+ETR_H1')[10:13])

So the question is how can I do that in an automated way for all possible combinations and store the results in new data.frame  which would look like this:

Ref.No. Region  IM.type Taxonomy        IM_1    IM_2    IM_3    IM_4    VC_1    VC_2    VC_3    VC_4
1622    South America   PGA     ER+ETR_H1       1.00E-06        0.08    0.16    0.24      3.49e-294               3.449819e-05  0.002748889     0.01122911

Best, ,
ioanna

```