solve function results come as function not numbers
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I'm trying to solve an equation using solve functuion and it did solve it correctly but the output resulrs comes as a function not numbers the code is below
clc
clear all
close all
syms n
p=4;
v=230;
R=0.2;
f=input('f = ')
Ns=120*f/p;
s=(Ns-n)/Ns;
VLL=v*sqrt(3);
Pg=3*v^2*s/R;
Pd=Pg*(1-s);
Po=10.5*1000*(n/1800)^3;
eqn=Pd-Po;
S=solve(eqn,n);
n= S(S>0);
P_out=Po/1000;
R=[f VLL n P_out]
command window results :
f =
60
R =
[ 60, 7008228810380513/17592186044416, (20700*557^(1/2))/7 - 476100/7, (7*n^3)/3888000000]
回答（1 个）
Sulaymon Eshkabilov
2021-6-5
Here is the corrected part of your code:
...
n= double(S(double(S)>0));
P_out=subs(Po/1000, n);
R=double([f VLL n P_out])
2 个评论
Abdullah Ismail
2021-6-5
Sulaymon Eshkabilov
2021-6-5
This is correct. This is how matlab displays floating point data by your matlab format display settings. You can change data display format settings using format eng or format short eng or format rat or ....
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2021-6-5
2021-6-5
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