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axelletapp
Switzerland
Posts |
 Posted - 12/10/2007 : 04:09:19 AM
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Origin Version (Select Help-->About Origin): 7.5 SR6
Operating System: XP
I would like to write a small routine which shift curve, by finding the maximum (in the y axis) and shift it (along x axis) to a given theoretical x value.
The following code works, but xatymax finds maximum in the entire curve. I would like to limit to say (+- delta) around the theoretical value. Probably an easy question: how can i specify this range ?
Thanks for your input.
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Worksheet wks = Project.ActiveLayer();
if(!wks)
{
printf("The active layer is not a worksheet, or there is nothing in the project");
}
else
printf("Worksheet %s has %d columns\n",wks.GetPage().GetName(),wks.GetNumCols());
if(wks.GetNumCols()==2) {
int colnum = wks.AddCol(); //Add a new column
}
Curve crv(wks, 0,1);
double dXatYmax = xatymax(crv);
printf("Value of X at maximum Y is %fs degree.\n", dXatYmax);
Dataset xvalue(wks,0);
Dataset shifted(wks,2);
shifted = xvalue - (dXatYmax - maximumpeak); |
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Deanna
China
Posts |
Posted - 12/10/2007 : 04:54:19 AM
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Hi Axelletapp,
You can use the following function to find the maximum Y value and the corresponding X value for part of a curve. Please use the parameters iLowerBound and iUpperBound to select this part of the curve.
void test6272(int iLowerBound = 0, int iUpperBound = -1)
{
Dataset dsA("Data1_A");
Dataset dsB("Data1_B");
Dataset dsTemp(dsB); //Create a copy of column B
dsTemp.SetLowerBound(iLowerBound);
dsTemp.SetUpperBound(iUpperBound);
double dMin, dMax;
uint iMin, iMax;
dsTemp.GetMinMax(dMin, dMax, &iMin, &iMax);
out_double("Maximum Y = ", dMax);
out_double("X for maximum Y= ",dsA[iMax]);
}
Deanna
OriginLab Technical Services |
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axelletapp
Switzerland
Posts |
Posted - 12/10/2007 : 09:10:08 AM
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Thanks for the quick reply.
Actually what i want is the following:
Move the curve in the x direction, by picking an experimental peak (not necessary the absolute maximum of the curve), which is to be found in a given range around a theoretical value and move the curve accordingly to this shift.
So i could adapt your code:
void shiftcurverange(double maximumpeak, double range = 1.0)
{
Worksheet wks = Project.ActiveLayer();
if(!wks)
{
printf("The active layer is not a worksheet, or there is nothing in the project");
}
else
printf("Worksheet %s has %d columns\n",wks.GetPage().GetName(),wks.GetNumCols());
if(wks.GetNumCols()==2) {
int colnum = wks.AddCol(); //Add a new column
}
Dataset dsA(wks,0); // declare column 1 as original x value
Dataset dsB(wks,1); // declare column 2 original y value
Dataset dsBTemp(dsB); // create a copy of column B
double dMin, dMax;
uint iMin, iMax;
dsBTemp.GetMinMax(dMin, dMax, &iMin, &iMax);
out_double("Absolute Maximum Y (counts) = ", dMax);
int r1,r2; // lower and upper X values for max search in Y values
int i1 = dsA.GetLowerBound(); // save lower bound
int i2 = dsA.GetUpperBound(); // save upper bound
for(int i=i1; i<i2; i++)
{
if( dsA[i]>= (maximumpeak - range) ) break;
}
r1 = i<i2 ? i : i1;
for(i=r1+1; i<=i2; i++)
{
if( dsA[i]>=(maximumpeak + range) ) break;
}
r2 = i>i2 ? i2 : i;
dsBTemp.SetLowerBound(r1);
dsBTemp.SetUpperBound(r2);
// out_double("Lower index boundary = ", r1 );
// out_double("Uppwer boundary = ", r2);
dsBTemp.GetMinMax(dMin, dMax, &iMin, &iMax);
out_double("Maximum Y (counts) = ", dMax);
out_double("X for maximum Y (deg)= ",dsA[iMax]);
out_double("shift angle (deg)= ",dsA[iMax] - maximumpeak);
Dataset shifted(wks,2);
shifted = dsA - (dsA[iMax] - maximumpeak);
}
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maximum in a given range