Initializing a complex dynamic array (with real part from one array, and imaginary from other array)?

[Ali Çehreli]

On 7/21/21 2:17 AM, drug wrote:

 >      auto z = zip(x, y)                      // concatenate two ranges
 >          .map!(a=>Complex!double(a[0],a[1])) // take the current first
 > element of the first range as the real part and the current first
 > element of the second range as the imaginary part
 >          .array;                             // convert the lazy range
 > to a dynamic array, probably you can avoid but this depends on how you
 > use it later

One of the *nonexistent* ;) features of D is automatic tuple expansion, 
which works only in foreach loops. I think it makes the code much more 
readable in this case:

        Complex!double[] z;

        import std.range;
        import std.algorithm;

        foreach (re, im; zip(x, y)) {
          z ~= complex(re, im);
        }

An alternative is lockstep:

        foreach (re, im; lockstep(x, y)) {
          z ~= complex(re, im);
        }

Ali