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SFares14-Alexandrite
14-Alexandrite
August 19, 2021
Solved

Why two different Results in Matrix Multiplication

Hello,

Attached is Mathcad 15 file. I don't know why i am getting two different results with matrix multiplication.

SFares_0-1629377930018.png

Thanks,

Sam

StuartBruffAnswer
23-Emerald V
August 19, 2021

Because the displayed values of your calculations of k' and deltaM75 are only accurate to 3 or 4 decimal places.   Try displaying the results to 7 decimal places and multiplying, and you should get agreement (1.3922).

 

Stuart

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3 replies

StuartBruff23-Emerald VAnswer
23-Emerald V
August 19, 2021

Because the displayed values of your calculations of k' and deltaM75 are only accurate to 3 or 4 decimal places.   Try displaying the results to 7 decimal places and multiplying, and you should get agreement (1.3922).

 

Stuart

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SFares14-AlexandriteAuthor
14-Alexandrite
August 19, 2021

I never thought that the number of decimals make such a difference. Thank you so much Stuart!

 

Regards,

Sam

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StuartBruff23-Emerald V
23-Emerald V
August 19, 2021

No worries, Sam, it had me puzzled for a bit until the word "round-off" popped into my skull.

 

Stuart

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