"Unwrap" the radian phase angle in a vector.

[QV_8300850]

I am using Mathcad Prime Release 5.0

I have data where the first column is angle theta that makes ~5 revolutions (0 to 360 degrees) and a second column that corresponds to a 'y' value. I would like to graph the data from 0 to 5*360 degrees (0 to 1800 degrees on the 'x' axis). Is there a function that will allow the theta data to get adjusted? MATLAB has a function called "unwrap" that would be similar ("unwraps the radian phase angles in a vector"). Note: The angle theta is captured experimental data with some variation in the rate (i.e. there is a new data point ~every 2 to 3 degrees).

[terryhendicott]

Hi,

Could you please supply the data as a starting point.

Cheers

Terry

[VladimirN]

Please upload your Mathcad Prime worksheet here.

[terryhendicott · Accepted solution]

Hi,

Have made up some sample data.  I think the unwrap program listed here is  what you are after?

If in radians not degrees you will need to adjust.

It is Prime 7 so someone may save it back for you.

It does not take long to type in the unwrap function.

Cheers

Terry

[terryhendicott]

Hi,

Prime 4 file enclosed you should be able to open this.

[QV_8300850]

Terry,

Thank you for the solution....that is what I was looking for!

For reference, below is a method a coworker sent over, but your solution is more elegant since it does it in a single step. 

Note:  The matrix origin is 1. 

In the future I will make sure to supply additional data.

V/R,

Quentin 

[Werner_E]

I guess the easiest way would be to use the built-in function "phasecor".

Of course the argument vector has to be a vector of angles. Here is Terry's example using phasecor

[QV_8300850]

thanks!  That does work well.

Quentin