arrayofarrays

I've two data sets in array: arr1 = [ ['2011-10-10', 1, 1], ['2007-08-09', 5, 3], ... ] arr2 = [ ['2011-10-10', 3, 4], ['2007-09-05', 1, 1], ... ] I want to combine them into one array like this: arr3 = [ ['2011-10-10', 1, 1, 3, 4], ... ] I mean, just combine those lines with the same date column. EDIT Thanks everyone, Just for clarification, I don't need those lines which not appear in both array, just drop them. jason Organize your data differently (you can easily convert what you already have to two dict s): d1 = { '2011-10-10': [1, 1], '2007-08-09': [5, 3] } d2 = { '2011-10-10': [3, 4],

Case 1: When I write char*str={"what","is","this"}; then str[i]="newstring"; is valid whereas str[i][j]='j'; is invalid. Case 2: When I write char str[][5]={"what","is","this"}; then str[i]="newstring"; is not valid whereas str[i][j]='J'; is valid. Why is it so? I am a beginner who already get very confused after reading the other answers. Sourav Ghosh First of all : A suggestion: Please read about arrays are not pointers and vice-versa !! That said, to enlighten this particular scenario, In the first case , char*str={"what","is","this"}; does not do what you think it does. It is a constraint