Ternary Operators

You have a set of stock prices that you want to analyze. Based on a set of rules, you want to determine any buy, sell, or hold action to take.

Source:

Transformation:

You can perform evaluations of this data using ternary operators to determine if you want to take action.

To assist in evaluation, you might first want to create columns that contain the cost (Basis) and the current value (CurrentValue) for each stock:

Single row formula

(Qty * BuyPrice)

'Basis'

Single row formula

(Qty * CurrentPrice)

'CurrentValue'

Now, you can build some rules based on the spread between Basis and CurrentValue.

The most important action is determining if it is time to sell. The following rule writes a sell notification if the current value is $1000 or more than the cost. Otherwise, no value is written to the action column.

Single row formula

(CurrentValue - 1000 > Basis) ? 'sell' : ''

'action'

But what about buying more? The following transform is an edit to the previous one. In this new version, the sell test is performed, and if writes a buy action if the CurrentPrice is within 10% of the BuyPrice.

This second evaluation is performed after the first one, as it replaces the else clause, which did nothing in the previous version. In the Recipe panel, click the previous transform and edit it, replacing it with the new version:

Single row formula

((CurrentValue - 1000) > Basis) ? 'sell' : ((abs(CurrentValue - Basis) <= (Basis * 0.1)) ? 'buy' : 'hold')

'action'

If neither test evaluates to true, the written action is hold.

You might want to format some of your columns using dollar formatting, as in the following:

BuyPrice

NUMFORMAT(BuyPrice, '$ ##,###.00')

Results:

After moving your columns, your dataset should look like the following, if you completed the number formatting steps: