Construct matrix from vectors in Mathematica

[nikolafmf]

I have defined vectors which are to be column vectors of some matrix. How to tell Mathematica to construct such matrix whose column vectors are already defined vectors?

 

[Bill Simpson]

Mathematica doesn't usually distinguish row from column vectors and will use a vector as needed.

So if you have

In[1]:= v1={a,b};v2={c,d};

Then this will give you what you want

In[3]:= mat=Transpose[{v1,v2}]
Out[3]= {{a,c},{b,d}}

But if you have done something like this, thinking you need that for columns,

In[4]:= v1={{a},{b}};v2={{c},{d}};

then this will undo what you have done and give you what you want

In[6]:= mat=Transpose[{Flatten[v1],Flatten[v2]}]
Out[6]= {{a,c},{b,d}}

 

[nikolafmf]

It works! Thank you very much!