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[X-Y Plot plugin] region dissappears when ploting
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X-Y plot plotting two functions:  Basile Edited by moderator 26 June 2016 13:49:46(UTC)
| Reason: title updated - marked as bug
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Hi Basile. A bug without the file could be hard to interpret.
But, unregarding math or bugs, you're trying to use negative frequencies. Are you sure about what could be represent that? Also, a zero frequency, what is it? Direct current?
Frequencies also are usually represented in a log scale.
Best regards.
Alvaro.
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Alvaro, All you say about the physics of the problem, you are right. But look the mathematics, just plotting a function. Look above, the X.L(f) plots fine. Similarly plots fine if I use the Plot-2D.  Basile
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Hi Basile. You discover a couple of nice and unwanted visual special effects in blue. I know near nothing about smath plugins, and can't help about them.
Best regards.
Alvaro.
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Two things Basile: 1. Your unit systen is wrong [L => H, C => F] 2. Xc, XL have nothing to do with an LC circuit. XL is equal to f(x):= dontknow*x XC is equal to f(x):= 1/dontknow*x https://en.wikipedia.org/wiki/LC_circuit
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Jean,
My system of units is NOT wrong.
Capacitance in Farad
Inductance in Henry
Reactance of both in Ohm.
Basile
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Seems the issue is related to negative infinity |
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Basile, What you did is no not correct: You copied the L plot and put in it the C plot with the same L scales. So, the C plot flies in the blue. Someting like this: If you photograph a mouse and an elephant in the same bed, you won't see both. If you adjust for elephant, the mouse will be a dot pretty hard to isolate and enlarge unless you have zillions of MP resolution ... Jean 
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Jean,
Yes, it works with the Plot 2D.
The problem is with the X-Y plot. It disappears and freezes the instance of Smath!
As pointed by Davide a possible problem with minus infinity?
Basile
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Originally Posted by: Basile  The problem is with the X-Y plot. It disappears and freezes the instance of Smath!
As pointed by Davide a possible problem with minus infinity? NO => Not as you think. X_Y is not an autoplot, it is a plot range. If you plot sin(x) it falls in its default XY ranges OK. Otherwise you have to range both directions. X_Y does not supports few things: 1. It does not plot x. It does not understand that 'x' is implicit of 'x' = "1*x" neither implicit of 'x' = 'x+0' 2. It supports some common Engineering ranges 1*e ±3 [per say] but will crash Smath instance if you want to range 1*e ± -15 X_Y is lovely in many projects but not in others.
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By increasing the limit values of the function the graph does not pass through a pivotal point   Bug.sm (9kb) downloaded 13 time(s).
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Originally Posted by: Ber7 By increasing the limit values of the function That's right but not a bug. Just that above the Y magnitude 45, the canvas misses some points in the critial region. More: does not fill the circle, plots x instead of + Jean X_Y Plot wisely.sm (12kb) downloaded 18 time(s).
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 1 user thanked Jean Giraud for this useful post.
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