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Questions about NG image with (log) axis [message #85440]

Tue, 06 August 2013 23:38

Xin Tao
Messages: 40
Registered: April 2011

Member

Hi,

I'm not sure whether I understand the image function from IDL 8 correctly. I want to plot a 2D image with x and y axis. I've observed at least two strange behaviours. Please give me some help. Thanks.

data = dist(300)

My question 1: What determines the size of the image?
If I have

x=dindgen(300)*2
y=dindgen(300)

then im=image(data, x, y, axis_style=2) will give me an elongated image.

If I have
x=dindgen(300)
y=dindgen(300)

then im=image(data, x, y, axis_style=2) will give me an square image.

This behavior of the IMAGE function is strange to me.

My question 2: This looks like a bug.

If I have

x=dlinear(10, 100, 300) ;; create an array from 10 to 100 with 300 elements
y=dindgen(300)

and

im=image(data, x, y, /xlog, axis_style=2)

the image x axis has a value from 10^20, 10^40, ..., 10^100. This is certainly wrong to me.

Am I missing something here?

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[Message index]

		Questions about NG image with (log) axis By: Xin Tao on Tue, 06 August 2013 23:38
		Re: Questions about NG image with (log) axis By: Fabzi on Tue, 06 August 2013 23:53
		Re: Questions about NG image with (log) axis By: Xin Tao on Wed, 07 August 2013 02:22
		Re: Questions about NG image with (log) axis By: Fabzi on Wed, 07 August 2013 04:59
		Re: Questions about NG image with (log) axis By: Xin Tao on Wed, 07 August 2013 05:10
		Re: Questions about NG image with (log) axis By: chris_torrence@NOSPAM on Thu, 15 August 2013 10:37
		Re: Questions about NG image with (log) axis By: David Fanning on Thu, 15 August 2013 10:52
		Re: Questions about NG image with (log) axis By: Xin Tao on Thu, 15 August 2013 20:28

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