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Alek Richter
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Enlightened
Asked: 2021-12-22T01:11:14+00:00

‘x’ and ‘y’ lengths differ ERROR when plotting

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I just started using R. I am supposed to Calculate a new variable “Vehic_vol” from the sum of “Psgr_Vol” and “Lugg_Vol” and Plot this new variable against “CITY_MPG” for the whole data set but I end up with ‘x’ and ‘y’ lengths differ ERROR! Any thoughts?

Here is what I did:

Vehic_vol<-(VehicleData$Psgr_Vol + VehicleData$Lugg_Vol)
 plot (VehicleData$Vehic_vol, VehicleData$CITY_MPG)

Error in xy.coords(x, y, xlabel, ylabel, log) : 
  'x' and 'y' lengths differ

1 Answer

  2. Enlightened

    From the code you provided, Vehic_vol is not a column of VehicleData. If you enter in

    VehicleData$Vehic_vol

    it returns

    NULL

    Note that NULL and VehicleData$CITY_MPG have different lengths (use length() to verify that).

    Try this instead

    plot (Vehic_vol, VehicleData$CITY_MPG)

    or

    VehicleData$Vehic_vol <- (VehicleData$Psgr_Vol + VehicleData$Lugg_Vol)
plot (VehicleData$Vehic_vol, VehicleData$CITY_MPG)
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