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 Author Comment/Response JK 10/13/10 4:07pm Hi, everybody. I have a problem about the formula manipulation. I have a function called P which is a function of two variables T and Vm such as P=f(T,Vm). Then I do the parital differential of P with respect with Vm and set it to 0. dP/dVm=0 I want to express one variable T as the expression of Vm. I try "solve","findroot",but doesn't work because it is very comlex expression. dP/dVm=(E^(1.6856699639351487`/ T) (1.4551915228366852`*^-11 Vm^2 - 2566.2295125310848` T (Vm - 8.590085314294516`) (Vm + 99.06307714517084`)) + E^(0.8428349819675743`/ T) (Vm^2 (Vm (119.41639467401366` Vm - 4492.771028805535`) + 42257.58023505885`) - 292.13443595155593` T (Vm - 18.652822386923695`) (Vm - 8.590085314294516`) (Vm + 99.06307714517085`)) - 8.314` T (Vm - 18.65282309120741`) (Vm - 18.652821682639942`) (Vm - 8.590085314294539`) (Vm + 99.06307714517084`) - 126.78438622540031` Vm (Vm + 5.189597750299588`*^-15) ((Vm - 37.62273213045856`) Vm + 353.86749324006007`))/((Vm - 18.811366065229283`)^2 Vm^2 (17.56882583302598` E^( 0.8428349819675743`/T) + Vm - 18.652822386923685`)^2) hope somebody can help URL: ,

 Subject (listing for 'formula Substitution') Author Date Posted formula Substitution JK 10/13/10 4:07pm Re: formula Substitution qm2008q 12/05/10 04:13am
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