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Paul Maconochie

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In addition to the useful histogram options LogPlot already has, it would be good to be able to specify either a right hand or left origin axis.

My specific application is for geotechnical logs. To emphasise zones of poor quality rock people have logged estimated rock strength and RQD (or fracture frequency) as two histograms next to each other. Typically rock strength is on the left hand side and the scale starts from the right and goes from high to low so that the weakest rock has the longest histogram bars and the strongest rock has the shortest bars. On the right side RQD starts from the left hand side and the histogram bars are shortest for an RQD of 100% and longest for an RQD of 0%.

Thus for a zone of weak, highly fractured rock you would have you maximum length histogram bars that extend to the left and to the right from a central axis. This immediately attracts the eye of anybody scanning the drillhole logs to the area of greatest geotechnical interest.

Strength/Fracture data was commonly presented this way when logs were hand drawn. Early computer logging packages did not have this facility available so this way of presenting the data became less common (but no less useful). Some logging packages such as Earthworks Explorer and high end mining packages such as MineSight do provide you with the options to present histograms in the way I have described.

Paul Maconochie

GeoTek Solutions Pty Ltd

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The little buttons at the bottom of the Scaling group do allow you to change the axis but only aloow going from low values on the right to high values on the left. It should be a simple matter to make it work more like the curve columns. You might even consider using a block curve to represent this.

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