I'm not pretending to be an expert in Linear Algebra or in numerical computing and I certainly wouldn't dare to submit a full scale Linear Algebra library. (Though in all modesty, I probably could take one about 2/3 of the people out there working as professional programmers.) I'm just a computer engineer how thinks that matrices could be a very useful and handy tool in many situation, yet any time I reach out for it in my (standard) toolbox it's just not there. And if I go to the next DIY-market all I got offered is a whole range of highly sophisticated CNC-all-in-one solutions, that are very shiny and properly do an excellent job, but just won't fit into my modest workshop, where I just want to, let's say, drill a few holes. See my problem? And from what I read from the posts (this one as well as earlier ones) there are a few people out there feeling the same way. If you think that this doesn't belong to the standard, then please allow me to ask one question: Why is there a complex number class in the standard and what does it actually do? Complex numbers are useful in many situations, as matrices are, yet the complex number class doesn't support a single one of them. Or is there a function in the library to find the roots of a polynomial or one to transform a signal sample from the time to the frequency domain? No, and I think it shouldn't. So why is everybody so keen to have a function to find eigenvalues in a matrix class, which comes down to exactly the same problem? Actually the complex number class does next to nothing. It is essentially a structure of two equally typed elements, about the most primitive data structure one could think off. It only forwards a few operators of the base type, which are already available in the language or in some other library. By far the most complex function in the complex number class is the input operator. And yet, the class is there, it's in the standard and it is useful. (Well, at least it doesn't hurt.) All I'm trying to propose is to do the same thing with a two-dimensional array, about the second primitive data structure one could think of. (The third actually, one-dimensional arrays would come second, but it turned out that a matrix class without a dedicated vector class is more useful then vice versa and, after all, vectors are already in the standard too, though they do almost ignore the algebraic aspect of vectors.) This is not supposed to be an all-in-one solution, it shall only provide the most elementary stuff. By most elementary I mean operations, that are already there, somewhere in the standard. That's the reason I'm not too bothered about numerical problems. Adding two matrices doesn't impose more problems than folding a Plus-functor to a vector. It won't solve any equations, but matrices are not only about that. Andreas