MATLAB: Error solving system of inequalities

Control System Toolboxerrorinequalitiessolvesym:0-by-1

kvalue = solve(C(:,1)>0,k,'ReturnConditions',true);
k = kvalue.conditions;
As title states , I'm trying to solve this system. I tried to create my own routh criterion function and ,in order to check the result of the criterion ,I need to verify that all the elements of the first column of the matrix C are greater than zero. Therefore I have a system of inequalities with respect to k ,as you can see in the code I've attached, but when I run the code I keep getting the following error :
Warning: Unable to find explicit solution. For options, see help. 
> In solve (line 317)
  In routh (line 32) 
 
ans =
 
Empty sym: 0-by-1
What should I do? Thanks in advance.

Best Answer

Hi,
As mentioned, here by Star Strider you can include 'IgnoreAnalyticConstraints'
kvalue = solve(C(:,1)>0,k,'ReturnConditions',true,'IgnoreAnalyticConstraints',1);
to check if a solution exists or not. Even if there are multiple solutions for k, solve will give parameters and conditions according to that.
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