fabs problem on matrix variable

[sandwich_eater]

Using MSVC++ I get error C2665:
'fabs' : none of the 3 overloads can convert parameter 1 from type
'std::allocator<_Ty>::value_type'
with
[
_Ty=std::vector<double>
]

on code containing the following extract.

void func(std::vector<std::vector<double> > *a ...

double s ...

scale = scale + fabs(a[k]);

 

[Ian Malone]

Using MSVC++ I get error C2665:
'fabs' : none of the 3 overloads can convert parameter 1 from type
'std::allocator<_Ty>::value_type'
with
[
_Ty=std::vector<double>
]

on code containing the following extract.

void func(std::vector<std::vector<double> > *a ...

double s ...

scale = scale + fabs(a[k]);

I assume scale/s is a typo.
You're passing a pointer to a vector of vectors and treating
it as a vector of vectors. Dereference it first (*a)[k],
or pass a reference: void func(std::vector<std::vector<double>> &a)

 

[red floyd]

Using MSVC++ I get error C2665:
'fabs' : none of the 3 overloads can convert parameter 1 from type
'std::allocator<_Ty>::value_type'
with
[
_Ty=std::vector<double>
]

on code containing the following extract.

void func(std::vector<std::vector<double> > *a ...

double s ...

scale = scale + fabs(a[k]);

Because a is a pointer to a vector of vectors of double. Hence, a[k]
does not resolve to a double

try the following declaration:

void func(std::vector<std::vector<double> > &a)

 

[Ian Malone]

or pass a reference: void func(std::vector<std::vector<double>> &a)

Sorry inner declaration <std::vector<double> >
not <std::vector<double>>

 

[sandwich_eater]

That is an easier solution.