A few basic examples - Revision history

Grinberg at 07:57, 22 January 2020

2020-01-22T07:57:45Z

2020-01-22T07:54:39Z

2020-01-22T07:04:39Z

2020-01-21T15:00:13Z

2020-01-21T14:56:35Z

2020-01-21T14:43:53Z

2020-01-21T14:42:59Z

2020-01-21T14:33:45Z

2020-01-21T14:32:31Z

2020-01-21T14:31:31Z

@@ Line 58: / Line 58: @@
   dd_ex = sqrt(ii)+1;
-== Array indexing ==
+== Arrays ==
 ISIS/s-lang start counting array entries with zero. I.e., the first entry in an array has the index 0, the second 1, etc. If we want to print the third entry in the array <code>dd</code>, we have to write:
@@ Line 73: / Line 75: @@
   dd = dd_ex[idx];
-A very useful function is <code>where</code> which returns the indices of array entries that fullfill certain conditions. For example, if we want to know which entries in the array dd_ex are larger than 3, we can write:
+A very useful function is <code>where</code> which returns the indices of array entries that fullfill certain conditions. For example, if we want to know which entries in the array <code>dd_ex</code> are larger than 3, we can write:
   variable idx2 = where(dd_ex > 3);

← Older revision		Revision as of 07:54, 22 January 2020
Line 76:		Line 76:

	variable idx2 = where(dd_ex > 3);		variable idx2 = where(dd_ex > 3);
		+
		+
		+	== Loops and conditional statemens ==
		+
		+	=== For-loop ===

← Older revision		Revision as of 07:04, 22 January 2020
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	print(dd[2]);		print(dd[2]);
		+
		+	We can set the second entry in <code>dd</code> to 10.5 by writing:
		+
		+	dd[1] = 10.5;

	If we want to set dd equal to the first three entries of dd_ex, we have to write:		If we want to set dd equal to the first three entries of dd_ex, we have to write:

@@ Line 60: / Line 60: @@
 == Array indexing ==
-ISIS/s-lang start counting array entries with zero. I.e., the first entry in an array has the index 0, the second 1, etc. If we want to print the third entry in the array <code>dd</dd>, we have to write:
+ISIS/s-lang start counting array entries with zero. I.e., the first entry in an array has the index 0, the second 1, etc. If we want to print the third entry in the array <code>dd</code>, we have to write:
   print(dd[2]);
@@ Line 68: / Line 68: @@
   variable idx = [0,1,2];
   dd = dd_ex[idx];

← Older revision		Revision as of 14:56, 21 January 2020
Line 59:		Line 59:

	== Array indexing ==		== Array indexing ==
		+
		+	ISIS/s-lang start counting array entries with zero. I.e., the first entry in an array has the index 0, the second 1, etc. If we want to print the third entry in the array <code>dd</dd>, we have to write:
		+
		+	print(dd[2]);
		+
		+	If we want to set dd equal to the first three entries of dd_ex, we have to write:
		+
		+	variable idx = [0,1,2];
		+	dd = dd_ex[idx];

← Older revision		Revision as of 14:42, 21 January 2020
Line 43:		Line 43:

	If you print both arrays, you will see that <code>dd_ex</code> has entries that are all set to 0.0 and <code>ss_ex</code> entries that are all set to empty strings.		If you print both arrays, you will see that <code>dd_ex</code> has entries that are all set to 0.0 and <code>ss_ex</code> entries that are all set to empty strings.
		+
		+
		+	We can also create an array by directly assigning values to it's entries:
		+
		+	variable dd = [12.5,16.7,8.88];
		+
		+	Or we can create an integer array with values from 0 to 11:
		+
		+	variable ii = [0:11];
		+
		+
		+	ISIS/s-lang are clever enough to know how to do mathematical operations (+,-,*,/,^) on arrays if they are of the same length. A mathematical operation between an array and a simple number means that the same operation will be applied to all entries in the array. For example we can set all entries to <code>dd_ex</code> to the square root of <code>ii</code> plus 1.
		+
		+	dd_ex = sqrt(ii)+1;

@@ Line 14: / Line 14: @@
 You can get more information on any command by starting isis (just type <code>isis</code> in the console) and entering <code>help commandname</code>, e.g., <code>help print</code>.
-Now that we said hello to the world, we'll address some maths first.
+Now that we said hello to the world, we'll address some simple way to deal with variables first.
 Define a variable x that equals 7.5:

@@ Line 33: / Line 33: @@
   variable y = "hello";
-Let's create a double array of length 12 and an integer array of length 12:
+Let's create a double array of length 12 and an string type array of length 12:
   variable dd_ex = Double_Type[12];
-  variable ss_ex = Integer_Type[12];
+  variable ss_ex = String_Type[12];
 If you print both arrays, you will see that <code>dd_ex</code> has entries that are all set to 0.0 and <code>ss_ex</code> entries that are all set to empty strings.