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1 Replies and 1618 Views
Comfit function, LOGISTIC FIT 1618 1
Started by Deleted User
I am trying to fit data with a logistic curve using the COMFIT function. I know from help that it is possible, but they do not specify how to do it, or what relevant arguments must be used within the function. Does anyone know how to use it
Result = COMFIT( X, Y, A {, /EXPONENTIAL | , /GEOMETRIC | , /GOMPERTZ | , /HYPERBOLIC | , /LOGISTIC | , /LOGSQUARE} &91, SIGMA=variable&93 &91, WEIGHTS=vector&93 &91, YFIT=variable&93 )
My data set is two 1D arrays, of 8 values each holding X va...
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1618 |
31 Mar 2006 05:09 PM |
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1 Replies and 1696 Views
How to call Idl from fortran code 1696 1
Started by Deleted User
If I want to call IDL to plot in the fortran code, how can I do Could you give me some advicesThanks!
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1 |
1696 |
31 Mar 2006 03:19 AM |
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1 Replies and 1645 Views
open multi images in batch mode 1645 1
Started by Deleted User
Hello,
How can I open many data files(at the same time) from a directory, in batch mode wth IDLENVI, without any ineraction and get their fid
I tryed ENVI_OPEN_DATA_FILE, but it requires interaction in order to choose the filename!
many thanks
Athina
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1 |
1645 |
28 Mar 2006 05:00 AM |
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1 Replies and 1419 Views
I need a help. I´m Beginner 1419 1
Started by Deleted User
Someone can show me as serious a routine in IDL to show an image landsat 7 TM. Thank you
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1 |
1419 |
26 Mar 2006 05:54 PM |
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0 Replies and 1662 Views
matlab to IDL 1662 0
Started by Deleted User
I need to write in IDL the matlab function FILTFILT without success how can i do it
FILT FILT Description (from matlab help)
y = filtfilt(b,a,x) performs zero-phase digital filtering by processing the input data in both the forward and reverse directions (see problem 5.39 in &911&93). After filtering in the forward direction, it reverses the filtered sequence and runs it back through the filter. The resulting sequence has precisely zero-phase distortion and double the filter order. filt...
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1662 |
23 Mar 2006 02:50 AM |
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0 Replies and 1288 Views
Dinosaur hunting: Windows DDE 1288 0
Started by Deleted User
Don't laugh ... I need to write a DLM that uses Windows DDE to push and pull data from an optical design tool (ZEMAX). DDE is the only data-interface protocol that ZEMAX supports. Has anybody out there ever done such a thing
IDL has some old DDE-support functions lurking in its core, but they don't work reliably for me and they're unsupported 'dark' code. I need something I can troubleshoot/expand.
Thanks in advance for any info that may be lying around out there!
Eric Coppock
Ball A...
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1288 |
22 Mar 2006 10:51 AM |
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1 Replies and 1536 Views
Creating a User Defined RPC Reader? 1536 1
Started by Deleted User
Has anyone tried to create a user-defined RPC reader in ENVI
I've been trying to develop a user defined RPC reader, starting off with the example provided in the manual, along with an appropriately formatted RPC file. When I attempt to load the data, however, I get the error message...
'Error importing RPC coefficient parameters'
I have verified that the RPC structure that I return appears to be correctly populated, and that the reader appears fine until it returns the structure. (If I f...
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1 |
1536 |
21 Mar 2006 12:47 PM |
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0 Replies and 1426 Views
How can I reduce active memory used by program? 1426 0
Started by Deleted User
Dear IDL community,
I wrote a little program which calculates x, y, and z ground control points (gcp) for each pixel
of an image. To do this, I am placing pitch, roll, and yaw parameters into a formula given by
Hongjian and Shukai (2004)
The problem I have is that my program works fine for small images e.g. if I do have only 100 scanlines.
However, if I try to calulate the gcps for larger images (e.g. > than 5000 scanlines) the computer crashes because it uses too much active memory....
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1426 |
19 Mar 2006 01:42 PM |
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0 Replies and 1568 Views
Reading Envisat ASAR images with IDL 6.2 1568 0
Started by Deleted User
I'm trying to use IDL 6.2 software to read Envisat ASAR images such as those available at the ESA catalogues. Pease note that this type of files are usually read using BEAM software provided by the European Sapce Agency (ESA). Do you now if it is possible to do it with IDL 6.2, and if so what is the best way to start.
Best Regards.
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1568 |
17 Mar 2006 10:55 AM |
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0 Replies and 1505 Views
Reading *.hdf files with IDL 6.2 1505 0
Started by Deleted User
I'm trying to use IDL 6.2 software to read *.hdf images such as those provived by ESA catalogues or NASA Archived Data Sets. Pease note that this type of files are usually read using BEAM software provided by the European Sapce Agency (ESA). Do you now if it is possible to do it with IDL 6.2, and if so what is the best way to start.
Best Regards.
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1505 |
16 Mar 2006 03:20 AM |
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1 Replies and 1496 Views
Extracting coordinates of max in multi-dimensional arrays 1496 1
Started by Deleted User
I'm currently working on finding the maximum correlation between distorted images, and I have an array of all the values of the cross correlations between the distorted and a comparison image. I'm trying to find the coordinates of the maximum, not really the maximum itself. At the moment I have a three-dimensional array (that will be a five-dimensional) that has size (9,9,109) and the Max is returning the number 85, but I'm not certain how to extract the coefficients.
While I can keep track...
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1496 |
15 Mar 2006 09:26 AM |
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1 Replies and 1552 Views
Data shows up as flat line in WIDGET_DRAW item 1552 1
Started by Deleted User
I have a WIDGET_DRAW item that is defined by:
top = Widget_Draw(profiles, xs=560, ys=135)
When plotting data that has 32768 items or less the data plots fine. When plotting data that has 32769 items or greater the data just appears as a flat line. The data is of type short(dont know if this matters). Is 32768 a magic number that has something to do with the size of a short int How can I fix this
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1552 |
14 Mar 2006 12:04 PM |
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0 Replies and 1327 Views
customings iTools 1327 0
Started by Deleted User
I am trying to create a custom front end for the plot iTool but am having some difficulties with the object model. Are there any comprehensive examples or recommended books
Cheers
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1327 |
14 Mar 2006 05:10 AM |
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0 Replies and 1688 Views
ENVISAT ASAR Product 1688 0
Started by Deleted User
I failed to open ENVISAT- ASAR (ASA_IMP_1PNIPA20030305_151414_000000152014_00226_05290_0039.N1) data in correct coordinate. Why the coordinate not registered as open the other sattellite data
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1688 |
13 Mar 2006 11:10 PM |
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1 Replies and 1487 Views
about using function curvefit 1487 1
Started by Deleted User
I'm a user of IDL for just two weeks.
I want to use function curvefit,but find something hard to understand.
for example:
PRO gfunct, X, A, F, pder
bx = EXP(A&911&93 * X)
F = A&910&93 * bx A&912&93
pder = &91&91bx&93, &91A&910&93 * X * bx&93, &91replicate(1.0, N_ELEMENTS(X))&93&93
END
X = FLOAT(INDGEN(10))
Y = &9112.0...
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1487 |
13 Mar 2006 02:06 PM |
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0 Replies and 1531 Views
about using function curvefit 1531 0
Started by Deleted User
I'm a user of IDL for just two weeks.
I want to use function curvefit,but find something hard to understand.
for example:
PRO gfunct, X, A, F, pder
bx = EXP(A&911&93 * X)
F = A&910&93 * bx A&912&93
pder = &91&91bx&93, &91A&910&93 * X * bx&93, &91replicate(1.0, N_ELEMENTS(X))&93&93
END
X = FLOAT(INDGEN(10))
Y = &9112.0...
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1531 |
13 Mar 2006 02:06 PM |
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1 Replies and 1403 Views
Interpolation queries... 1403 1
Started by Deleted User
I am currently using IDL 5.4 to generate a 3D volume using numerous 2D image slices.
By using INTERPOLATE linear interpolation, I understand that I am able to produce evenly spaced interpolates between two interval points. Say, to create 12 evenly spaced interpolates between point 1 and point 30.
I am trying to use bilinear/trilinear interpolation to do the same. Is it possible If so, how do I go about it
The reason I need to do evenly spaced interpolates is due to the fact that I need t...
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1403 |
13 Mar 2006 01:56 PM |
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0 Replies and 1518 Views
Make exception when using broyden/newton function 1518 0
Started by Deleted User
I want to make a program that solves a non linear system with five
equations and five unknowns for each pixel of my picture data (one
system by pixel). I use broyden function and for certain pixel it
works good but for certain I have an error: 'MAXITS exceeded in
broydn.'. I think that the solutions do not converge. But I want to
know how to make the computation for all pixels even if I have an
error. I think that I must use the exception but I don't know how
I think that a sol...
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1518 |
13 Mar 2006 09:02 AM |
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1 Replies and 1594 Views
HLS sharpening 1594 1
Started by Deleted User
Dear IDL user,
I want to merge a low-resolution color image with a high-resolution grayscale image by means of ENVI image sharpening (HLS). From the ENVI4.2 user¡®s guide : transform/image sharpening, I not only learned how ENVI performed the HSV and HLS sharpening, but also that HLS sharpening can be performed the same way as HSV if some of the parameters in the routine RGB_TRANS_DOIT are changed. Because I am a new user of ENVI, and I knew very little about the IDL. I sincerely hope someone c...
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1594 |
09 Mar 2006 06:04 PM |
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1 Replies and 1547 Views
how can I continuously print out the coordinates, data of the cursor when the mouse is moving 1547 1
Started by Deleted User
I am new to this forum so, first of all, hello to everyone and thanks in advance for the help.
I'm truly a beginner in IDL so I suspect my problem should have a simple answer,
be patient in case this is true...
I'm writing a simple program which should plot together the coordinates, data of
the cursor when the mouse is moving. My problem is, I was planning to use cursor for this,
but the CURSOR procedure does not seem to work continuously, that is to say, the CURSOR
procedure does...
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1 |
1547 |
09 Mar 2006 01:26 PM |