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Re: make mape [message #94727 is a reply to message #94726]

Fri, 08 September 2017 02:56

Markus Schmassmann
Messages: 129
Registered: April 2016

Senior Member

On 09/07/2017 06:56 PM, AGW wrote:
> On Tuesday, September 5, 2017 at 2:05:03 PM UTC+2, AGW wrote:
>> Hi,
>>
>> I have 10000 values of h at specific 10000 values of x and y, every
>> values stored in idlsave file, I want to combine all values of h
>> at specific x,y in new array take this form
>>
>> hh=[x,y,h]
>>
>> where
>>
>> IDL> help,h
>> h FLOAT = Array[1, 1, 56]
>
> Sorry for this confusion, I have map 500 x 1000 pixels, I want to
> calculate the velocity of some pixels, I calculate it correctly, I
> want to make map of velocity, but the problem is I did not calculate
> all pixels so I want to put the new values of velocity in origin
> position (x & y). How can I do it

; Creating example data:
x_all=randomu(seed,10000)
y_all=randomu(seed,10000)
x=[0:1:(1./499)]
y=[0:1:(1./999)]
values_all=sin(!dpi*2*x_all)*cos(!dpi*2*y_all)

; Data for 10000 points calculated:
IDL> help, x_all, y_all, value_all
X_ALL FLOAT = Array[10000]
y_ALL FLOAT = Array[10000]
VALUE_ALL FLOAT = Array[10000]

; and the coordinates of your desired map is given by
IDL> help, x, y
X FLOAT = Array[500]
Y FLOAT = Array[1000]

; then you can create your map by
yourMap = GRIDDATA( x_all, y_all, values_all , /grid, xout=x, yout=y)

; exact for comparison
exact=rebin( sin(!dpi*2*x) ,[500,1000])* $
rebin(transpose(cos(!dpi*2*y)),[500,1000])

; show
im=image([yourMap,exact,yourMap-exact])

; I hope this is what you want, good luck, Markus

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[Message index]

		make mape By: Ali Gamal on Tue, 05 September 2017 05:05
		Re: make mape By: Markus Schmassmann on Tue, 05 September 2017 06:58
		Re: make mape By: Ali Gamal on Tue, 05 September 2017 08:31
		Re: make mape By: Markus Schmassmann on Wed, 06 September 2017 05:19
		Re: make mape By: Ali Gamal on Wed, 06 September 2017 11:32
		Re: make mape By: Markus Schmassmann on Thu, 07 September 2017 04:46
		Re: make mape By: Ali Gamal on Thu, 07 September 2017 09:56
		Re: make mape By: Markus Schmassmann on Fri, 08 September 2017 02:56
		Re: make mape By: Ali Gamal on Wed, 13 September 2017 05:09

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