// This macro demonstrates how to use string concatenation to 
// pass  variables to commands called using the run() function.
// It creates an image, sets the scale to 150 pixels/mm, rotates
// 25 degrees, and saves in Analyze format. Note that the file
// path must be enclosed in brackets because of the space in
// the image name.
//
// In ImageJ 1.43 and later variables can be passed by adding
// "&" to the variable name. File paths passed using this
// method do not have to be enclosed in brackets.

  name = "Test Image";
  directory = getDirectory("home");
  width = 400;
  height = 300;
  scale = 150; // 150 pixels/mm
  unit = "mm";
  angle = 25;
  newImage(name, "8-bit ramp", width, height, 1);
  if (getVersion>"1.43k") {
     run("Set Scale...", "distance=&scale known=1 pixel=1 unit=&unit");
     run("Arbitrarily...", "interpolate angle=&angle");
     path = directory+name;
     run("Analyze 7.5...",  "save=&path");
  } else {
     run("Set Scale...", "distance="+scale+" known=1 pixel=1 unit="+unit);
     run("Arbitrarily...", "interpolate  angle="+angle);
     path = "["+ directory+name+"]";
     run("Analyze 7.5...", "save="+path);
  }