why does control+c not work to stop a run away calculation

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I am solving a linear problem p=A\b where A is large, rectangular, and sparse. Prior to R2015b I was able to stop this calculation with a control+c when a mistake was made in the input (too large for the RAM or a badly scaled matrix element, etc.) and the calculation went into essentially an infinite loop. Now I am routinely having to kill the matlab process and restart matlab when things go wrong. Is there a change in the behavior of "\" calculations? What can be done to avoid the run away problem? BTW - sometimes the calculation terminates with the (correct) assessment that the problem exceeds available memory - but then at other times, it fails to identify the problem and runs until paging slows the calculation to a snails pace or all application memory is exhausted and my mac goes into the suspended app mode.

Answers (1)

Walter Roberson
Walter Roberson on 25 Sep 2015
Any call into the BLAS or LINPAK or similar libraries is not under the control of the control-C handler until the call returns.

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