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# hp 50g calculator dosent work properly

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Hi! I am a user of hp 50g graphing calculator and I noticed that it doesn't work properly.. What I mean is that it doesn't multiplies bacic matrices writing the message "invalid dimension", when tries to find the det(A)=0 of a 6*6 matrix with the variable x in its diagonal elements, it finds a 16 degree polynomial instead of a 6 degree polynomial! I am completely disappointed! What should I do??
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Hi,

What I mean is that it doesn't multiplies bacic matrices writing the message "invalid dimension"

Could you please give some examples of matrices that give you the errors?

it finds a 16 degree polynomial instead of a 6 degree polynomial!

This can happen when you are in Approximate mode. When doing symbolic operations, it is usually better to use Symbolic and Exact modes. In MODE -> CAS, UNcheck "Numeric" and "Approx".

Do this Before you enter the matrix or data. If you are entering data with decimals, enter it as fractions (you can use ->Q or ->Qpi in the Convert -> Rewrite menu (Leftshift 6 "Convert", "Rewrite", NXT)).

HTH

-Bart
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Thank you for the reply!! I think you just solved my second problem! 😊
an example of matrices that it doesn't multiply is [1 1 1]*[1;1;1]
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Hi,

Please check that the 1-row matrix is a matrix and not a vector:

If you are entering a 1-row matrix manually, use double [[  ]]

if using the matrix writer, uncheck VEC:

HTH

-Bart
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Thank you very much!!!! 🙂 🙂 🙂
you fill ally solved all of my problems!!! 🙂 🙂 🙂
😄 😄
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Thank you.

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