String/Array

Programming Questions

poltergei..

in Programming Questions • 10 months ago

I am trying to declare and populate a 2D string array.

Not working.

I think it is in how I am declaring the 'variable'... this still confuses me.

String[][] catTable;

String[] theFile = loadStrings("catagories.csv"); // NB lookup table to translate column labels in another list

for (int i = 0; i < theFile.length; i++) {

for (int j = 0; j < 2; j++) { // THERE ARE ONLY 2 COLUMNS

String[] pieces = split(theFile[i], ",");

String catTable[j][i] = pieces[j];

println (catTable[j][i]+" : "+pieces[j]);

}

Run like this I get error "expected semi, got 'catTable' " suggests "syntax error, maybe missing a semicolon"

But I think this isn't it.

if I comment out the lines referring to the 'catTable[][]' inside the loops it tells me the variable catTable isn't defined.

I've seen something similar done with 2D array, but it apparently used 'active' rather than 'passive' mode. Yet another thing that confuses.

Any help would be appreciated, just getting started in Processing.

Replies(2)

tfguy44

Re: String/Array

10 months ago

You're redefining catTable when you specify its type again in the for loops.

You never give it a defined size either.
Here's a working example:

String[] theFile = loadStrings("catagories.csv");
String[][] catTable = new String[theFile.length][2];
for (int i = 0; i < theFile.length; i++) {
String[] pieces = split(theFile[i], ",");
for (int j = 0; j < 2; j++) {
catTable[i][j] = pieces[j];
println("catTable[" + i + "][" + j + "] = " + catTable[i][j] );
}
}

poltergei..

Re: String/Array

10 months ago

Thanks that's very helpful.

I think I learned from this that when one uses a datatype declaration (String, float, etc) in any context, this is tatamount to declaring/defining the variable (ie. how I redefined it).

In terms of not giving it a length... I've seen something like it done both with and without (perhaps without the datatype). And to me this seems to be a difference in declaring an object class as you did vs. something less 'formal'. I have to review that page on 'objects' to get it to sink in better.

String/Array

Replies(2)

Re: String/Array

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