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p5.js 2-dimensional float array
[0 Replies]
28-Mar-2013 01:28 PM
Forum:
Processing with Other Languages
I'm trying to port my Processing scatterplot to Processing.js
My datapoints are stored in a txt file in this format:
"V1"
"V2"
"monitor/noun/BL_19990106_01/31625"
-0.12131594619236
-0.0714908515733397
"monitor/noun/BL_19990120_01/56648"
-0.322780246647713
0.108432169208681
"monitor/noun/BL_19990126_01/43890"
-0.161315099543655
0.0210510446479526
When I run my code with p5.js, my array gets filled with NaN instead of the floats.
Any suggestions?
The MWE:
// first line of the file should be the column headers
// first column should be the row titles
// all other values are expected to be floats
// getFloat(0, 0) returns the first data value in the upper lefthand corner
// files should be saved as "text, tab-delimited"
// empty rows are ignored
// extra whitespace is ignored
class FloatTable {
int rowCount;
int columnCount;
float[][] data;
string[] rowNames;
string[] columnNames;
FloatTable(string filename) {
string[] rows = loadStrings(filename);
string[] columns = split(rows[0], TAB);
columnNames = subset(columns, 1); // upper-left corner ignored
columnCount = columnNames.length;
rowNames = new string[rows.length-1];
data = new float[rows.length-1][];
// start reading at row 1, because the first row was only the column headers
for (int i = 1; i < rows.length; i++) {
// split the row on the tabs
string[] pieces = split(rows[i], TAB);
// copy row title
rowNames[rowCount] = pieces[0];
// copy data into the table starting at pieces[1]
data[rowCount] = float(subset(pieces, 1));
// increment the number of valid rows found so far
rowCount++;
}
// resize the 'data' array as necessary
data = (float[][]) subset(data, 0, rowCount);
}
int getRowCount() {
return rowCount;
}
string getRowName(int rowIndex) {
if(rowIndex >= 0)
return rowNames[rowIndex];
else
return null;
}
string[] getRowNames() {
return rowNames;
}
// Find a row by its name, returns -1 if no row found.
// This will return the index of the first row with this name.
// A more efficient version of this function would put row names
// into a Hashtable (or HashMap) that would map to an integer for the row.
int getRowIndex(string name) {
for (int i = 0; i < rowCount; i++) {
if (rowNames[i].equals(name)) {
return i;
}
}
//println("No row named '" + name + "' was found");
return -1;
}
// technically, this only returns the number of columns
// in the very first row (which will be most accurate)
int getColumnCount() {
return columnCount;
}
string getColumnName(int colIndex) {
return columnNames[colIndex];
}
string[] getColumnNames() {
return columnNames;
}
float getFloat(int rowIndex, int col) {
return data[rowIndex][col];
}
}
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