Could that be done via exporting/importing the coordinates/area to/from an external script?]]>

I am able to shade a polar-function circle centred at the origin (eg r(t)=1). I am also able to construct a relation circle (eg (x-2)^2+(y-2)^2=1) away from the origin, but then Insert Shading is greyed out. How do I shade a circle not centred at (0,0)?

Thanks for any guidance!

]]>Hi. Scrub my previous post. I have read another post where you answer this question.

chris

]]>Graph allows for the x-axis to have a radians scale by checking the "show as multiples of pi" checkbox. This is useful for seeing trig functions in radians. Can you setup a similar feature where we can see trig functions with the x-axis in degrees (for exanple seeing the first period of any trig function going from -180 degrees to 180 degrees or 0 degrees to 360 degrees).

I could do this using the zoom button but this would not illustrate the first period of a trig functions.

chris

]]>Thanks. I created an Excel fle containing 30 columns of data, each column containing 500 values, and Graph managed to import this file as 29 separate point series without any problems.

chris

]]>https://www.padowan.dk/bin/plugins/ImportExcel.zip]]>

Yes, you're right about querying where x=i would be on the Re axis. I wasn't thinking straight at the time I tried this example out. This is an example of the user (me) not paying attention. In this sense it would be good for an error messsage to come up such as "invalid input".

chris

]]>Thanks. I love the way you can plot the 1st Excel column versus the 2nd and subsequent Excel columns as different point series.

The problem (if it is a problem) is that in the point-series dialogue box some values are not listed exactly as they are listed in the Excel file. For example, starting with a value of "0.6" in cell A1, I then generate subsequent values of 0.7 to 1.5 using the formula "=A1+0.1" and copying this formula all the way down to cell A10. But Graph doesn't import these values exactly as they are. E.g. 0.8 in Excel become 0.7999999999999999 in graph (Pic attached)

Can you fix this?

chris

]]>You are probably right that Graph should at least give a warning in this case. I will try to implement that. I don't know where you expected x=i to be on the x-axis. However I actually thought y=i^2 would work. But I can see that Graph evaluates points using real numbers only. I will fix that so they can evaluate using complex numbers as long as the result is a real number.]]>

Thanks.

Me, not being able to use your programs settings!

Actually there are 2 Real roots (2 & 3) and 2 Irrational roots (1.8189364... & 3.61800635...)

If there's any way I can help please let me know (but remember I'm 83 and slowing down!)

Regards

Pete]]>

However your file doesn't have anything in column A, which is why the imported point series contain no values. To make it work you need to place all the x-values in column A and the y-values in column B, C, D, etc. You also need to start the values from row 1, though it will also work if you have a description in row 1 and start the values in row 2.

I can see that the plugin doesn't work when the Excel file contains formulas. I have now fixed that in an updated plugin:

https://www.padowan.dk/bin/plugins/ImportExcel.zip