Why am I getting a quadprog error Unexpected Standard exception from MEX file. What() is:bad allocation?

I was solving some problems using quadprog but I observed that for larger inputs I run into the following message: error in quadprog 

Unexpected Standard exception from MEX file.

What() is:bad allocation

..

The same code is able to run on other computers, but takes an extremely long time.

Answer 1

[MathWorks Support Team]

This error is due to a memory issue. 

Making all matrices sparse before calling quadprog reduces the computing time and also eliminates the error.