PROSAGA码农传奇-matlab-如何修复Matlab求解计算误差/求解器给出一个变量而不是数字答案？

<div class =“post-text”itemprop =“text”>
  <P>
    你搞砸了一下
     <code>
      solve
    </code>
    。看起来你的等式没有真正的解决方案，你强迫它
     <code>
      'Real',true
    </code>
     它应该是：
  </p>
   <pre>
    <code>
      z1 = 0.01188354;
z2 = 0.20291147;
z3 = 0.03386809;
z4 = 0.6087344;
z5 = 0.1426025;
k1 = 0.00211577;
k2 = 433.816504;
k3 = 0.00651267;
k4 = 12.8652437;
k5 = 3.25E-06;

syms q
eqn = k1*z1/(1+q*(k1-1)) + k2*z2/(1+q*(k2-1)) + k3*z3/(1+q*(k3-1)) + k4*z4/(1+q*(k4-1))+ k5*z5/(1+q*(k5-1)) == 1;
qvalue = solve(eqn,q)

</code>
  </pre>
  <P>
    输出是：
  </p>
   <pre>
    <code>
      root(z^5 - (553951988707451897271725042874967932463648393519489496501295701298760653356885564069*z^4)/146344515065711958525050250689493211538989295698771861545387136571113311336350613504 + (877647369043978904163970290106419962713606423192038983322127636310825879207936*z^3)/164487327751721471763565140886077743965784030575734255347857322244873703346919 - (3796080934806054258394941458065140559250786119491250988496078448019381612969984*z^2)/1151411294262050302344955986202544207760488214030139787435001255714115923428433 + (838076006172751803233223399262272123114675605549658858976242221943722830987264*z)/1151411294262050302344955986202544207760488214030139787435001255714115923428433 + 21452770321210561747759866301918995558818778263453224281332504760441104236544/1151411294262050302344955986202544207760488214030139787435001255714115923428433, z, 1)
root(z^5 - (553951988707451897271725042874967932463648393519489496501295701298760653356885564069*z^4)/146344515065711958525050250689493211538989295698771861545387136571113311336350613504 + (877647369043978904163970290106419962713606423192038983322127636310825879207936*z^3)/164487327751721471763565140886077743965784030575734255347857322244873703346919 - (3796080934806054258394941458065140559250786119491250988496078448019381612969984*z^2)/1151411294262050302344955986202544207760488214030139787435001255714115923428433 + (838076006172751803233223399262272123114675605549658858976242221943722830987264*z)/1151411294262050302344955986202544207760488214030139787435001255714115923428433 + 21452770321210561747759866301918995558818778263453224281332504760441104236544/1151411294262050302344955986202544207760488214030139787435001255714115923428433, z, 2)
root(z^5 - (553951988707451897271725042874967932463648393519489496501295701298760653356885564069*z^4)/146344515065711958525050250689493211538989295698771861545387136571113311336350613504 + (877647369043978904163970290106419962713606423192038983322127636310825879207936*z^3)/164487327751721471763565140886077743965784030575734255347857322244873703346919 - (3796080934806054258394941458065140559250786119491250988496078448019381612969984*z^2)/1151411294262050302344955986202544207760488214030139787435001255714115923428433 + (838076006172751803233223399262272123114675605549658858976242221943722830987264*z)/1151411294262050302344955986202544207760488214030139787435001255714115923428433 + 21452770321210561747759866301918995558818778263453224281332504760441104236544/1151411294262050302344955986202544207760488214030139787435001255714115923428433, z, 3)
root(z^5 - (553951988707451897271725042874967932463648393519489496501295701298760653356885564069*z^4)/146344515065711958525050250689493211538989295698771861545387136571113311336350613504 + (877647369043978904163970290106419962713606423192038983322127636310825879207936*z^3)/164487327751721471763565140886077743965784030575734255347857322244873703346919 - (3796080934806054258394941458065140559250786119491250988496078448019381612969984*z^2)/1151411294262050302344955986202544207760488214030139787435001255714115923428433 + (838076006172751803233223399262272123114675605549658858976242221943722830987264*z)/1151411294262050302344955986202544207760488214030139787435001255714115923428433 + 21452770321210561747759866301918995558818778263453224281332504760441104236544/1151411294262050302344955986202544207760488214030139787435001255714115923428433, z, 4)
root(z^5 - (553951988707451897271725042874967932463648393519489496501295701298760653356885564069*z^4)

</code>
  </pre>
</DIV>