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matlab question with sym

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LIU WEIHUA
LIU WEIHUA 2011-11-28
When I using the function of 'norm' with norm(F,Inf),the command window shows a line of the words with "Undefined function or method 'norm' for input arguments of type 'sym'". Actually,F is a matrix with real number,however, it comes from some other matrix which is define by sym. So ,How I can make norm(F,Inf) successfully?

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Walter Roberson
Walter Roberson 2011-11-28
norm(double(F),Inf)

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