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Help ! HP-42S Invalid Type Error



#4

I have a 42-s that is giving an "invalid type" error whenever I attempt to perform ANY of the statistical functions (E+ or E-)- any of them. Other functions and features work fine.

This is bugging me as this is my workhorse and has been working for me without problem since the 80's.

Doug


#5

Ok, so how often does the same person that posted the question have the first response? Duh, Well I tried to clear the summation register and couldn't - same error. So I cleared everything (CLALL). Oh well, I can punch in the several programs I had later..

Then I got another error - Size error. So then I relocated the first summation register to R11 (default), and poof it works.... Whew !

In the process of this whole problem, I have discovered that there is a world of HP calc nuts out there (I guess I am now an accomplice too.) I am disappointed to dsicover that HP has discontinued the 42s. I can see why so many folks love it. I used to just think it was an old HP (dime a dozen) and I treated it pretty rough (a testament to its ruggedness. Now that I know I will probably pay more to replace it than I paid for it, I will treat it accordingly.


#6

Hi,

I tried to simulate in my 13-old and tired 42S the error you've mentioned on your help request

1- If your stack is empty and you enter a real number and use the E+/E-, the answer is the counting number of your entry.
2- If your x-reg has a complex number (i.e. -1 SQRT)) and you use E+/E-, the answer is the Invalid Type error message.
3- If your x-reg has a matrix (i.e. [7X7 MATRIX]) and you use E+/E-, the answer is Dimension Error message.
4- If your x-reg has a real number and y-reg has a matrix or a complex number and you use E+/E-, the answer is the Invalid Type error message.

It seems old 42S' E+/E- function uses two real arguments in x and y-registers. Try checking the contents of the y-reg in your program before using E+/E- function.

Hope it can help


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