Code: Select all
struct HISTORY
{
int x;
int y;
int z;
int A[20][20];
int B[20][20];
char Operation[20];
int C[20][20];
char type[10];
char defined;
}HIS;
void SaveHistory(HISTORY X)
//This function will save the operations history.
{
ofstream H("HISTORY.DAT", ios::app | ios::binary);
H.write((char*)&X, sizeof(X));
H.close();
}
void DisplayHistory()
//This function will display the history.
{
ifstream I("HISTORY.DAT", ios::in | ios::binary);
HISTORY Y;
int Count = 0;
while(I.read((char*)&Y, sizeof(Y)))
{
Count++;
cout<<"\tOPERATION #"<<Count<<":\n\n";
cout<<"Matrix #1:"<<endl;
DISPLAY(Y.A, Y.x, Y.y);
if(strcmpi(Y.type, "binary"))
{
cout<<"\n\nMatrix #2:"<<endl;
if(strcmpi(Y.Operation, "multiplication"))
DISPLAY(Y.B, Y.y, Y.z);
else
DISPLAY(Y.B, Y.x, Y.y);
}
cout<<"\n\nOperation:"<<Y.Operation;
if(Y.defined != 'N')
{
if(strcmpi(Y.Operation, "multiplication"))
{
cout<<"\n\nResult:"<<endl;
DISPLAY(Y.C, Y.x, Y.z);
}
else
{
cout<<"\n\nResult:"<<endl;
DISPLAY(Y.C, Y.x, Y.y);
}
}
else
cout<<"Not defined."<<endl;
getch();
cout<<"\n\n-----------------------------------------------------------------------------\n\n";
}
I.close();
}
void ClearHistory()
//This one will clear history.
{
/* for this one I think we just have to overwrite the file. yeah*/
ofstream J("HISTORY.DAT", ios::out | ios::binary);
HISTORY Z;
J.write((char*)&Z, sizeof(Z));
J.close();
//still have to test whether this works
}
A[i][k]
to be honest i didnt think about any specific uses.Scytale wrote: ↑Sun Sep 03, 2017 8:33 pmCurious about the Einstein notation here usage in code CF, is it really possible to signify co- and contravariance in code and iterate over the appropriate indices?
Or do you mean in the more general form of tensor notation as opposed to classical vector notation?
edit: OR, do you write all vectors as 2D arrays but make the covariant ones 1xn and contravariant nx1? That makes more sense to me
My bad, I didn't realize you meant implied summation over repeated indicesCornflakes_91 wrote: ↑Mon Sep 04, 2017 2:23 am
to be honest i didnt think about any specific uses.
I just thought that the generally iterative structure might give her insights on how to simplify her matrix code
I could also be an idiot and conflate the general index notation and einstein notation and make a fool of myselfScytale wrote: ↑Mon Sep 04, 2017 10:15 amMy bad, I didn't realize you meant implied summation over repeated indicesCornflakes_91 wrote: ↑Mon Sep 04, 2017 2:23 am
to be honest i didnt think about any specific uses.
I just thought that the generally iterative structure might give her insights on how to simplify her matrix code
It's all good mah bro! I got fixated on the wrong aspect of it. I think very often the terms are interchangeable anywayCornflakes_91 wrote: ↑Tue Sep 05, 2017 6:26 amI could also be an idiot and conflate the general index notation and einstein notation and make a fool of myselfScytale wrote: ↑Mon Sep 04, 2017 10:15 amMy bad, I didn't realize you meant implied summation over repeated indicesCornflakes_91 wrote: ↑Mon Sep 04, 2017 2:23 am
to be honest i didnt think about any specific uses.
I just thought that the generally iterative structure might give her insights on how to simplify her matrix code
Users browsing this forum: No registered users and 12 guests