"idea of direction" is correct and usable in written English.
You can use it to refer to a plan of action or a general aim someone is trying to achieve. For example, "I am trying to move forward in my career, so I need to come up with a clear idea of direction."
Argand associates this second real component with an imaginary number, although "these lines are quantities quite as real as the positive unit ; they are derived from it by the association of the idea of direction with that of magnitude, and are in this respect like the negative line, which has no imaginary signification.
This can already be done, of course, but it's done in a rather clumsy way, by taking the signals from multiple microphones and applying algorithms to sort out the noise, compare waveforms to determine which is stronger whereas to get an idea of direction and so on.
"I remember when I first started DJing and bought myself a pair of decks on Kijiji with no real idea of direction or what to start with.
We have partially incorporated this idea of direction by calculating signs attached to the p-values.
As will be shown later, this idea of internal direction extends for Mach all the way up to his ideas on the purpose of science.
A broader problem is that Japan has been so used to the idea of Government direction of the economy that few leaders seem to have a vision of the direction that most of the industrialized world is headed.
After this final attempt, however, the idea of determining direction was scrapped.
Mr Fujimori has slowed down the pace of privatisation, and has given no clear idea of the direction of economic policy for his third term.
The policy statement was a general idea of the direction the administration would like for legislation to take.
