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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  • 11 Answers

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


A) IF YOU GET AN ERROR MESSAGE,

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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B) IF YOU DO NOT GET AN ERROR MESSAGE

Usually as soon as you start entering an expression in the Y= editor screen, the = sign is highlighted to ensure the drawing of a function. However, if you have previously used the Transfm application to draw dynamic graphs, it takes over the graphing functionalities from the native OS and you can only draw a single graph.
The reason is that dynamic graphing needs one or two parameters that can be changed during the graphing process and the graph redrawn with a new value of a parameter, and you end up with a family of curves differing one from the other by the values of one parameters. But since the calculator has space for 10 graphs at most, only one function can be highlighted.

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.

  1. Press the [Apps] key.
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I am no seer, nor will I try to guess what may have happened. This error may come from various conditions
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