Measured resonance in RLC -> drawing graphs with Matlab.

[Kruum]

Drawing graphs with errors using Matlab.

I'm writing my first serious report, yay!, from the measurements we made with series RLC -circuit. I'm supposed to determine the values of the two coils we used as well as their self-inductanses. We had four different circuits: R, L₁ and C in series, R, L₂ and C in series, R, L₁, L₂ and C in series and for the last one we swapped the direction of the current through L₂. For each circuit we did six measurements using six different capacitors.

 

[Kruum]

Okay, a new try. I've got the data to make a line, now all I have to do is to use some program, preferably Matlab, to draw the lines.
Here's an example of what I mean:
http://www.aijaa.com/img/b/00738/3901755.jpg


And here's the data, where \Delta indicates error:
http://www.aijaa.com/img/b/00931/3901739.jpg

 

[MATLABdude]

Do you mean drawing in the dashed max / min lines? If you used the MATLAB plot function with two coordinates, it'll draw a line between them. For instance:

>> plot(dependent, independent, [x1, x2], [y1, y2], '-')

(where x1, y1 is a datapoint and x2, y2 is another) would plot your stuff, and draw a dashed line between the points (x1, y1) and (x2, y2).

http://www.mathworks.com/access/helpdesk/help/techdoc/ref/plot.html

 

[Kruum]

Do you mean drawing in the dashed max / min lines? If you used the MATLAB plot function with two coordinates, it'll draw a line between them.

Yep, that's the case. So basically I need to draw three different lines in Matlab to achieve the result pictured in my second post?

 

[MATLABdude]

Yep, that's the case. So basically I need to draw three different lines in Matlab to achieve the result pictured in my second post?

You could use the hold command, or just add some extra arguments to your plot command:

hold
plot(...)
plot(x-coordinates_of_dashed_line_1, y-coordinates_of_dashed_line_1, '-k')
plot(x-coordinates_of_dashed_line_2, y-coordinates_of_dashed_line_2, '-k')
hold

or do it all in one swoop:
plot(x_points, y_points, x-coords_of_dashed_line_1, y_coords_of_dashed_line_1, '-k', x-coords_of_dashed_line_2, y_coords_of_dashed_line_2, '-k')