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Why do I get "Argument to dynamic structure reference must evaluate to a valid field name" error please? code attached.

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MAHMOUD ALZIOUD
MAHMOUD ALZIOUD 2018-11-15
评论： madhan ravi 2018-11-15
My code:
Nf= 471913097;
DI_year = (sum(ESAL_year)/Nf)*100;
DI_6months = (sum(ESAL_6months)/Nf)*100;
DI_3months = (sum(ESAL_3months)/Nf)*100;
DI_1month = (sum(ESAL_1month)/Nf)*100;
DI_2weeks = (sum(ESAL_2weeks)/Nf)*100;
DI_1week = (sum(ESAL_1week)/Nf)*100;
DI= [DI_year;DI_6months;DI_3months;DI_1month;DI_2weeks;DI_1week];
FC= (1/60)*(6000/(1+exp.(4.96711-2.48356.*log10(DI.*100))));
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madhan ravi
madhan ravi 2018-11-15
编辑：madhan ravi 2018-11-15
instead of
FC= (1/60)*(6000/(1+exp.(4.96711-2.48356.*log10(DI.*100))));
^-------causes error
should be
FC= (1/60)*(6000./(1+exp(4.96711-2.48356.*log10(DI.*100))));
^---------added dot here after sir Walters comment
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