| MATHSTAT_154: Dynamically Loadable Module is unavailable on this platform: IMSL [message #71340] |
Mon, 14 June 2010 15:12  |
Lauren Hunkins
Messages: 4
Registered: June 2009
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Junior Member |
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Hello all,
I'm fairly new at using IDL and I'm working with someone else's code.
I've made a few minor modifications but none that should effect the
code that is giving me trouble. Inside the IDL library file
IMSL_LINPROG.pro it calls the system function MATHSTAT_154. I'm not
sure how to fix this.
; Call the system function.
;
err_status = 0L
MATHSTAT_154, type, err_status, a_cvt, $
b_cvt, $
c_cvt, $
m, $
n, $
bu_cvt, $
dual_spc, $
irtype_cvt, $
itmax_cvt, $
obj_spc, $
xlb_cvt, $
xub_cvt, $
result
IF (ARG_PRESENT(dual)) THEN dual = dual_spc
IF (ARG_PRESENT(obj)) THEN obj = obj_spc
;
; Return
RETURN, result
END
Thanks,
Lauren
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| Re: math [message #73673 is a reply to message #71340] |
Mon, 22 November 2010 11:13  |
Ammar Yusuf
Messages: 36
Registered: October 2010
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Member |
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On Nov 22, 7:04 am, MC <morefl...@gmail.com> wrote:
> There are several routines, search the online help for "differential
> equation"
>
> Here's one from the help:
>
> PRO LSODETEST
>
> ; Define the step size:
> H = 0.5
> ; Define an initial X value:
> X = 0.0
> ; Define initial Y values:
> Y = [4.0, 6.0]
> ; Integrate over the interval (0, 0.5):
> result = LSODE(Y, X, H, 'differential')
>
> ; Print the result:
> PRINT, result
> END
> FUNCTION differential, X, Y
> RETURN, [-0.5 * Y[0], 4.0 - 0.3 * Y[1] - 0.1 * Y[0]]
> END
>
> Note that function can have more parameters passed that can control
> its behaviour, which may be what you are asking for in Q3. I can't
> understand your 2nd and 4th Q's
>
> Cheers MC
>
> On Nov 22, 9:58 am, amin farhang <farhang.a...@gmail.com> wrote:
>
>> dear readers,
>> i have some questions about IDL
>> 1. how can i solve differential equations in IDL? i know that the RK4
>> function do it but it is very obscure, may you introduce a simple
>> method to solve all differential equations?
>> 2. what is the simplest way for taking the integrals directly
>> (specially 1D integrals) without write a function?
>> 3. How do I define a function that its parameters could be changed in
>> every calling (for example in every step of FOR-DO loop, function
>> return a new value)?
>> 4. does functions could return a paramedical equations? if OK how?
>> thank you so much and sorry for my many questions
>> best regards,
>
>
For this
2. what is the simplest way for taking the integrals directly
(specially 1D integrals) without write a function?
You can probably use the total function. I'm pretty sure that
would be the easiest.
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| Re: math [message #73687 is a reply to message #71340] |
Mon, 22 November 2010 04:04 |
MC
Messages: 50
Registered: September 1996
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Member |
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There are several routines, search the online help for "differential
equation"
Here's one from the help:
PRO LSODETEST
; Define the step size:
H = 0.5
; Define an initial X value:
X = 0.0
; Define initial Y values:
Y = [4.0, 6.0]
; Integrate over the interval (0, 0.5):
result = LSODE(Y, X, H, 'differential')
; Print the result:
PRINT, result
END
FUNCTION differential, X, Y
RETURN, [-0.5 * Y[0], 4.0 - 0.3 * Y[1] - 0.1 * Y[0]]
END
Note that function can have more parameters passed that can control
its behaviour, which may be what you are asking for in Q3. I can't
understand your 2nd and 4th Q's
Cheers MC
On Nov 22, 9:58 am, amin farhang <farhang.a...@gmail.com> wrote:
> dear readers,
> i have some questions about IDL
> 1. how can i solve differential equations in IDL? i know that the RK4
> function do it but it is very obscure, may you introduce a simple
> method to solve all differential equations?
> 2. what is the simplest way for taking the integrals directly
> (specially 1D integrals) without write a function?
> 3. How do I define a function that its parameters could be changed in
> every calling (for example in every step of FOR-DO loop, function
> return a new value)?
> 4. does functions could return a paramedical equations? if OK how?
> thank you so much and sorry for my many questions
> best regards,
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