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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Re: I cannot get sinreg to work

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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I am trying to get the TI 83 Plus to fit a sine graph to data that I have in Lists 1 and 2. I typed in the command SinReg L1, L2, Y1. I got an error message:\r\nERR: SINGULAR MAT. What is wrong? What do I...

I was having the same problem. Whenever I hit the graph button after a linear function was entered in Y1 I would get a screen that said "ERR: INVALID DIM 1:Quit"
I messed with a lot of settings but ended up returning settings back to default. The thing that fixed the calculator's ability to graph was UN-highlighting the Plot1, Plot2, and Plot3 words. If they are white on black they are highlighted. If the words are black then they are UN-highlighted.
To UN-highlight Plot1, Plot2, Plot3, do this: move the cursor up to the highlighted Plot1 and hit "enter." Notice the difference? Now do the same to the others and see if it fixes your problem like it fixed mine.
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I am trying to do SinReg but my calculator wont let me! HELP!!!!!

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May 01, 2010 | Texas Instruments TI-89 Calculator

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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
  1. Press [2nd][Y=] to open the (STAT PLOT) menu.
  2. Select [4:PlotsOff] and
  3. Press [ENTER].
  4. Calculator displays Done
  5. Restart your graphs.
  6. Adjust the window dimensions if necessary or use the ZOOM function to have all graphs displayed.


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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  3. Select it and press [ENTER].
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Another potential culprit is the Inequalz App. To Uninstall it, do as for the Transfm and select the option that will unload it from memory.

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If you are graphing from the plot menu, this error lets you know that one of the lists you are graphing is longer than the other.

Another way to fix the problem is to reset the calculator by pressing 2nd button then plus sign then 7 then 1 then 2. This will reset the calculator however if you are graphing from lists, your data will be erased. Hope this helps.

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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
1. The most common reason is an omitted right parenthesis. For instance you press the [sin] function key. It shows as sin( , notice the right parenthesis. You enter the variable, say X, and you press [ENTER]. The calculator gives you a syntax error: It does not know what to do as long as you do not insert the closing parenthesis.
2. Another common source of this error message is the use of the regular MINUS sign instead of the (-). The latter appears on the scren as a smaller, raised minus sign. This is especially true when you want to raise a number or a variable to a negative exponent.

Every function has one way it takes in its food (argument). If you don't do it the right way, it gives you an error. The nice thing is that the calculator gives you the opportunity to correct the error. Whenever you see Error 1:quit 2: Go to, choose GO TO because the calculator shows you exactly the symbol that is creating havoc: It will be highlighted.

Hope it helps.

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Clear all ram
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Hope it helps.

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