Task

Write two equal-sized numerical arrays 'x' and 'y' to
a two-column text file named 'filename'.

The first column of the file contains values from an 'x'-array with a
given 'xprecision', the second -- values from 'y'-array with 'yprecision'.

For example, considering:

   x = {1, 2, 3, 1e11};
   y = {1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791}; 
                                                          /* sqrt(x) */
   xprecision = 3;
   yprecision = 5;

The file should look like:

   1    1
   2    1.4142
   3    1.7321
   1e+011   3.1623e+005

This task is intended as a subtask for Measure relative performance of sorting algorithms implementations.




import std.file, std.conv, std.string;
 
void main() {
    auto x = [1.0, 2, 3, 1e11];
    auto y = [1.0, 1.4142135623730951,
              1.7320508075688772, 316227.76601683791];
    int xPrecision = 3,
        yPrecision = 5;
 
    string tmp;
    foreach (i, fx; x)
        tmp ~= format("%." ~ text(xPrecision) ~ "g      %." ~
                      text(yPrecision) ~ "g\r\n", fx, y[i]);
 
    write("float_array.txt", tmp);
}