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**badly scaled Matrix?!!**

Hello,

Scilab help states that If a matrix is badly scaled or nearly singular, a warning message will be displayed:

"matrix is close to singular or badly scaled." (http://help.scilab.org/docs/5.3.3/en_US/inv.html)

What do these terms mean? "well scaled" , "badly scaled" , "nearly singular"

Can anyone please give explanation with example to me?

Thanks in advance.