Question

matlab取roots里的实根

你好请问一下
t=20;%定义温度值
P=0.5;%定义压强值
p=[54.525-0.12103722*t,0.14307*t-75,0.057*t,-P];roots(p)%解密度值

解是这个
ans =

1.3737
0.0054 + 0.0834i
0.0054 - 0.0834i
请问一下如何取它的实数根 1.3737

Answer 1

t=20;%定义温度值
P=0.5;%定义压强值
p=[54.525-0.12103722*t,0.14307*t-75,0.057*t,-P];
a=roots(p);%解密度值
for i=1:length(a)
y=real(a);
end
disp(y)

Answer 2

t=20;%定义温度值
P=0.5;%定义压强值
p=[54.525-0.12103722*t,0.14307*t-75,0.057*t,-P];
a=roots(p);%解密度值
for i=1:length(a)
if ( imag(a(i)) == 0 )
y=a(i);
end
end
disp(y)