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

Question

almohanned alsufyani 2023-3-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1931510-the-numbers-do-not-appear-in-standard-format-despite-the-writing-format-shortg

回答： Star Strider 2023-3-19

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

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Answer 1

Dyuman Joshi 2023-3-19

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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

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Answer 2

VBBV 2023-3-19

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https://ww2.mathworks.cn/matlabcentral/answers/1931510-the-numbers-do-not-appear-in-standard-format-despite-the-writing-format-shortg#answer_1196280

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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

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VBBV 2023-3-19

在 MATLAB Online 中打开

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

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Answer 3

Star Strider 2023-3-19

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https://ww2.mathworks.cn/matlabcentral/answers/1931510-the-numbers-do-not-appear-in-standard-format-despite-the-writing-format-shortg#answer_1196290

在 MATLAB Online 中打开

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