Hello:
I have ArrayList strat_list of integers like this:
index value
[0] 3
[1] 4
[2] 2
[3] 1
[4] 6
[5] 4
[6] 3
[7] 2
[8] 5
[9] 8
[10] 6
[11] 2
I want to put the content of the list in 2 dimensional array to get a
matrix like this:
3421
6432
5862
This is what I am doing:
int k = 4;
int[,] myArr = new int[strat_list.Count,k];
myArr = (int[,])strat_list.ToArray(typeof(int[,]));
But it gives me InvalidCastException error.
Could you give me a hint how to fix the problem?
Thanks,
GB 4 1612
GB wrote:
Hello:
I have ArrayList strat_list of integers like this:
index value
[0] 3
[1] 4
[2] 2
[3] 1
[4] 6
[5] 4
[6] 3
[7] 2
[8] 5
[9] 8
[10] 6
[11] 2
I want to put the content of the list in 2 dimensional array to get a
matrix like this:
3421
6432
5862
This is what I am doing:
int k = 4;
int[,] myArr = new int[strat_list.Count,k];
myArr = (int[,])strat_list.ToArray(typeof(int[,]));
But it gives me InvalidCastException error.
Could you give me a hint how to fix the problem?
You have to write the loops yourself; this is not such a common problem
that the Framework methods will do it for you.
for (int i = 0; i < (strat_list.Count + 3) / 4; i++)
{
for (int j = 0; j < 3; j++)
{
int k = i * 4 + j;
if (k < strat_list.Count)
{
myArr[i, j] = strat_list[k];
}
else
{
myArr[i, j] = 0; // or whatever the default should be
}
}
}
Thank you,
It gives me the 2 dimensional array of 12 by 4.
Can I get the array of 3 by 4 ( to eleminate rows with 0's)?
GB
"Bruce Wood" <br*******@canada.comwrote in message
news:11**********************@h48g2000cwc.googlegr oups.com...
>
GB wrote:
Hello:
I have ArrayList strat_list of integers like this:
index value
[0] 3
[1] 4
[2] 2
[3] 1
[4] 6
[5] 4
[6] 3
[7] 2
[8] 5
[9] 8
[10] 6
[11] 2
I want to put the content of the list in 2 dimensional array to get a
matrix like this:
3421
6432
5862
This is what I am doing:
int k = 4;
int[,] myArr = new int[strat_list.Count,k];
myArr = (int[,])strat_list.ToArray(typeof(int[,]));
But it gives me InvalidCastException error.
Could you give me a hint how to fix the problem?
You have to write the loops yourself; this is not such a common problem
that the Framework methods will do it for you.
for (int i = 0; i < (strat_list.Count + 3) / 4; i++)
{
for (int j = 0; j < 3; j++)
{
int k = i * 4 + j;
if (k < strat_list.Count)
{
myArr[i, j] = strat_list[k];
}
else
{
myArr[i, j] = 0; // or whatever the default should be
}
}
}
Bruce Wood wrote:
GB wrote:
Hello:
I have ArrayList strat_list of integers like this:
index value
[0] 3
[1] 4
[2] 2
[3] 1
[4] 6
[5] 4
[6] 3
[7] 2
[8] 5
[9] 8
[10] 6
[11] 2
I want to put the content of the list in 2 dimensional array to get a
matrix like this:
3421
6432
5862
This is what I am doing:
int k = 4;
int[,] myArr = new int[strat_list.Count,k];
myArr = (int[,])strat_list.ToArray(typeof(int[,]));
But it gives me InvalidCastException error.
Could you give me a hint how to fix the problem?
You have to write the loops yourself; this is not such a common problem
that the Framework methods will do it for you.
for (int i = 0; i < (strat_list.Count + 3) / 4; i++)
{
for (int j = 0; j < 3; j++)
{
int k = i * 4 + j;
if (k < strat_list.Count)
{
myArr[i, j] = strat_list[k];
}
else
{
myArr[i, j] = 0; // or whatever the default should be
}
}
}
Sorry... should have been "for (int j = 0; j < 4; j++)" not j < 3.
The problem here is most likely in your array allocation, at the start.
Try this:
int numRows = (strat_list.Count + 3) / 4;
int[,] myArr = new int[numRows,4];
for (int i = 0; i < numRows; i++)
....
(Instead of "for (int i = 0; i < (strat_list.Count + 3) / 4; i++)".
Also, note my other post that the "j" loop should have been "for (int j
= 0; j < 4; j++)", not j < 3.)
GB wrote:
Thank you,
It gives me the 2 dimensional array of 12 by 4.
Can I get the array of 3 by 4 ( to eleminate rows with 0's)?
GB
"Bruce Wood" <br*******@canada.comwrote in message
news:11**********************@h48g2000cwc.googlegr oups.com...
GB wrote:
Hello:
I have ArrayList strat_list of integers like this:
>
index value
>
[0] 3
[1] 4
[2] 2
[3] 1
[4] 6
[5] 4
[6] 3
[7] 2
[8] 5
[9] 8
[10] 6
[11] 2
>
I want to put the content of the list in 2 dimensional array to get a
matrix like this:
3421
6432
5862
This is what I am doing:
int k = 4;
int[,] myArr = new int[strat_list.Count,k];
myArr = (int[,])strat_list.ToArray(typeof(int[,]));
>
But it gives me InvalidCastException error.
Could you give me a hint how to fix the problem?
You have to write the loops yourself; this is not such a common problem
that the Framework methods will do it for you.
for (int i = 0; i < (strat_list.Count + 3) / 4; i++)
{
for (int j = 0; j < 3; j++)
{
int k = i * 4 + j;
if (k < strat_list.Count)
{
myArr[i, j] = strat_list[k];
}
else
{
myArr[i, j] = 0; // or whatever the default should be
}
}
}
This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
by: Mark Oueis |
last post by:
ArrayList arrayList = new ArrayList();
foreach (Blabla bla in Blablas)
{
arrayList.Add(Convert.ToInt32(blabla.something));
}
so far this works great..
but now
|
by: Sunny |
last post by:
Hi,
I have a small function, that returns a string, inside
the function, there is an arraylist, being processed.
At the end of the function all the elements of the
ArrayList are copied to my...
|
by: Derrick |
last post by:
If i have an ArrayList, add a bunch of MyClass classes to it, how do I get a
MyClass out of it? I've tried:
MyClass clses = ArrayList.ToArray(typeof(MyClass));
but get errors about not being...
|
by: Hans De Schrijver |
last post by:
I have a private ArrayList variable that holds objects of various types,
though they're all derived from a common base class (User).
What I would like to do is provide public accessor properties...
|
by: Jack Addington |
last post by:
I have a method that takes an array of nodes (UltraNode) as a parameter.
I've got an arrayList of objects that I am trying to convert to UltraNodes
and pass to the method but I cannot seem to get...
|
by: Dirk |
last post by:
Hello
The following code does not work
ArrayList __gc* allControls = new ArrayList();
.....
// put some Controls in allControls
....
Control __gc* arr = dynamic_cast<Control...
|
by: Russ Green |
last post by:
I am currently working on a small VB.NET utility that accesses the Microstation VBA object model via COM.
I have this code which I am trying to get to work...
The key bits of information are
...
|
by: Alex Chudnovsky |
last post by:
I have come across with what appears to be a significant performance bug in
..NET 2.0 ArrayList.Sort method when compared with Array.Sort on the same
data. Same data on the same CPU gets sorted a...
|
by: Michael Howes |
last post by:
I have many double that each have a few thousand numbers in them.
I need to concatenate groups of these double arrays into a new set of
double.
I don't know the total # of points.
I thought it...
|
by: wolima |
last post by:
I have to create a arraylist of arrays. So, at the end, I have to
convert this arraylist in a two dimmensional array.
I wrote something like this.
ArrayList myAL = new ArrayList();
double...
|
by: BarryA |
last post by:
What are the essential steps and strategies outlined in the Data Structures and Algorithms (DSA) roadmap for aspiring data scientists? How can individuals effectively utilize this roadmap to progress...
|
by: nemocccc |
last post by:
hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?
|
by: Hystou |
last post by:
There are some requirements for setting up RAID:
1. The motherboard and BIOS support RAID configuration.
2. The motherboard has 2 or more available SATA protocol SSD/HDD slots (including MSATA, M.2...
|
by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However,...
|
by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can...
|
by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers,...
|
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each...
|
by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing,...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new...
| |