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Old September 15th, 2009, 05:24 PM
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Help please! How to make the X-axis in logarithm scale in TI-84

Hi
is there any way to draw an graph so that choose logarithm scale on the x-axis and normal scal on the Y-axis in the grafic calculator TI-84???
for example
Y-axis = 1 2 3 4 5 6 7 8 9 10..........
X-axis = 10 100 1000 10000 100000 1000000 ........
i am trying but it seem to be no solving

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Old September 15th, 2009, 07:07 PM
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As far as I am aware the TI calculators cannot do this.

To make the x-axis look like it is in log scale, you can take the base 10 log of the entire function. For example, instead of
Code:
y1 = x
use
Code:
y1 = log(x)]


To make the y-axis look log scale is principally the same as the above,
Code:
y1 = x
becomes
Code:
log(y1) = x


But of course this is no longer in the form the calculator accepts, you need to solve for y1:
Code:
y1 = 10^x


Note that this is will merely imitate log-scale for graphical purposes. if you're pulling values off the graph, remember that if you have the x-axis in log scale as above, the value you pull is really (log(x), y) and not (x, y). To make that point usable, you'd need to calculate 10^x to get the real x-value.

This is really a pretty poor hack-job. Basically, to make the y look like log scale, you're stretching the x-values. To make the graph look like it's log scale in x, you're compressing the x-values. If you were to try to achieve full log scale doing this... Unfortunately,
Code:
log(y1) = log(x)
reduces to simply
Code:
y = x
and that's a purely linear graph.

[Edit] Sorry, I did things stupidly the first time.

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Old September 15th, 2009, 07:35 PM
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Thanks archnaid for answer,in fact i want to draw the (Bode plot),i have measyring value for the frequency(x-axis which should be in logarithm scale) and (output gain) on the y-axis(normal scale).
i have already put this value in (stat) function (L1 and L2).
do you have som program that can do this job?
is there any program to draw the bode plot when i have it as a function?
sorry for bad language.
thanks in advance

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Old September 16th, 2009, 05:55 PM
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Oh your language is fine, I can understand what you're saying better than some people who speak primarily English!

Bode plots - now I know exactly what we're trying to do. I don't not have any programs that will take a transfer function and give you the Bode plot of the frequency response; actually, I don't even have a TI-84 compatible calculator.

I know TI has a free app for electrical engineering, called EE*Pro, but it seems like it only runs on the TI-89, TI-92, and Voyage 200 - in short, all the calculators that have a Motorola 68k processor, and not the Z80 the TI-83/83/86 variants run.

I did a little digging on Google and ticalc.org, but I'm not seeing much.

Is there any particular reason you need to do this on the calculator? If not, there are free computer softwares which should be able to do this.

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Old September 16th, 2009, 11:11 PM
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Thank you for reply,i searched so much in the internet but i could not find any thing even no body ask about it (it is very strange).Because of I am new user for TI-84, i wanted to know every thing about it.I know there is many computer program can do the same job but i wanted to did it by TI-84.
any way I thing i will buy TI-89 titanium .

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