# The numbers do not appear in standard format despite the writing (format shortG)

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almohanned alsufyani on 19 Mar 2023
Answered: Star Strider on 19 Mar 2023
format shortG
Mf=6.480554950317725e+03;
Cp_sea=3.976;
t_out=100;
t_in=25;
Qu=Mf*Cp_sea*(t_out-t_in); %useful heat gain (kw)
fprintf('useful heat gain = %dKw\n\n',Qu)
_________
In the previous code, the value of Mf was calculated by an equation and the output was as it appeared despite writing (format shortG) in the first line of the code, and then when adding the (fprintf) command, the output also appears in the long Formula e+3, so how do I overcome this problem

Dyuman Joshi on 19 Mar 2023
Using format is only applicable to numeric outputs.
Change the formatting operator in fprintf to obtain the proper value -
format shortG
Mf=6.480554950317725e+03;
Cp_sea=3.976;
t_out=100;
t_in=25;
Qu=Mf*Cp_sea*(t_out-t_in) %useful heat gain (kw)
Qu =
1.9325e+06
fprintf('useful heat gain = %g Kw\n\n',Qu)
useful heat gain = 1.9325e+06 Kw

VBBV on 19 Mar 2023
Use %f format specifier
format shortG
Mf=6.480554950317725e+03
Mf =
6480.6
Cp_sea=3.976;
t_out=100;
t_in=25;
Qu=Mf*Cp_sea*(t_out-t_in); %useful heat gain (kw)
fprintf('useful heat gain = %.2f kW\n\n',Qu) % use %f
useful heat gain = 1932501.49 kW
VBBV on 19 Mar 2023
Try forcing the computed variable using vpa
format shortG
Mf=6.480554950317725e+03
Mf =
6480.6
Cp_sea=3.976;
t_out=100;
t_in=25;
% syms Cp_sea t_out t_in
Qu = vpa(Mf*Cp_sea*(t_out-t_in),8) % somehow
Qu =
1932501.5
% Qu=vpa(subs(Mf*Cp_sea*(t_out-t_in),{Cp_sea,t_out,t_in},{3.976,100,25}),7) %useful heat gain (kw)
fprintf('useful heat gain = %.2f kW\n\n',Qu) % use %f
useful heat gain = 1932501.49 kW

Star Strider on 19 Mar 2023
One option is to use string arrays —
format shortG
Mf=6.480554950317725e+03;
Cp_sea=3.976;
t_out=100;
t_in=25;
Qu=Mf*Cp_sea*(t_out-t_in); %useful heat gain (kw)
fprintf("useful heat gain = " + Qu + " Kw\n\n")
useful heat gain = 1932501.4862 Kw
.

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