# plot x, y and direction

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Hi all,

I have values for x, y, and Azimuth, where Azimuth is in range of 0 to 360 degree measured from the North in clockwise.

how can I plot them in a 2D graph which shows the point with direction arrow?

x

607261.185639785

607280.329476425

607367.827131141

y

4821687.60219055

4821678.02095485

4821646.17145724

direction

108

108

115.142857142857

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### Answers (7)

Walter Roberson
on 21 Jan 2011

You probably want to use quiver() to plot your vector fields.

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Walter Roberson
on 21 Jan 2011

To change from compass direction (in degrees) with north being 0, to standard cartesian angles measured counter-clockwise from y=0, use

planar_angle = mod(90 - compass_angle, 360);

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Walter Roberson
on 21 Jan 2011

The q variables are logical vectors indicating whether each angle is in a particular quadrant. data(q3==1,1) selects only the rows of data that are in quadrant 3, and selects column 1 from the resulting array.

Instead of modifying the existing code to change the logic, go back to the original logic, but copy the assignment of those constants to data into a new variable planar_data, then comment out the assignment to data; then in the planar_data array, set the third column to your sample compass degrees that you want for testing purposes. After that step, assign

data = [planar_data(:,1,2) mod(90 -planar_data(:,3),360)];

Once you have the demonstration going, make it in to a function that takes planar_data as a parameter instead of assigning hard-coded values to it.

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Ankita Misra
on 8 Nov 2017

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Walter Roberson
on 9 Nov 2017

theodore panagos
on 7 Nov 2018

Edited: Walter Roberson
on 7 Nov 2018

The formula f(E,N) give an angle that starts from the north,is clockwise,runs from 0 to 360 degrees

and is used in surveying.

f(E,N)=180/pi()*(pi()-pi()/2*(1+sign(N))*(1-sign(E^2))-pi()/4*(2+sign(N))*sign(E) -sign(N*E)*atan((abs(N)-abs(E))/(abs(N)+abs(E))))

There is N(northing)=N2-N1 and E(easting)=E2-E1 ,the formula works for any value of N and E and the result for N=E=0 is undefined.

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