Fix c++ compile error
Fix c++ compile error

This fixes an error:

```
a space is required between consecutive right angle brackets (use '> >')
```

johnmarinelli/nmatrix,agisga/nmatrix,johnmarinelli/nmatrix,agisga/nmatrix,johnmarinelli/nmatrix,johnmarinelli/nmatrix,agisga/nmatrix,agisga/nmatrix