Question about Texas Instruments TI-84 Plus Calculator

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I cannot get sinreg to work

I have all my data entered and my graph is turned on, but for some reason, sin reg wont work and I get the error message singular mat...Can you tell me whats wrong? I have a TI-84 plus.

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Here are a few things to try.

First, I'd check whether the students put the data
into lists other than L1 and L2. If you do SinReg
with no arguments, the machine defaults to using L1
and L2.

Second, check degree versus radian mode.

Third, I have had problems in the past with SinReg
when the data were *too good*. I think a singular
matrix might be the culprit in a case like this, but I
doubt that's the problem here. If you think it might
be, try deleting every other data point and try the
regression again.

Posted on Mar 22, 2008


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Won't graph two functions


it might be worthwhile to let us know its contents. If you do get a message ( INVALID DIM) you should turn the statistical plots OFF.
To turn statistical plots off
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To make a long story short, you must Uninstall the Transfrm application from memory. The procedure will not erase it, just kick it out of memory.

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Hope it helps.

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