Concatenate Arrays of different size and data types with blanks

I have a struct with volts, current, temp, and timestamp for each unit. The each measure has it's own timestamp. So my current struct has columns for: "unitID" (single value), "Volts", "voltage timestamp", "current", "Current timestamp", "Temp", "temp timestamp", and "baseline" (single value). I need to concatenate these measurements into an array with the following format:

For reference, the length of each of these will be 50,000+

[Walter Roberson]

If the same timestep appears for multiple measurements, should the data be merged? It does not appear to be in your example -- for example 1:00:00 AM has volts and current and temp but you do not construct a single

a 2 55 12 12:00:00 AM 5

for that.

Anyhow, you will need to convert to your numbers to character vectors to do what you want. Numeric table() cannot display emptiness in entries.

[Amanda Beatty]

Thank you! Converting everything to character vectors was the missing link for me to concatenate this the way I wanted.