Drawing lines on existing chart with macro-computed data in Excel 2010

[PLLman]

I have charted a couple of spirals on a worksheet and now want to connect the the corresponding points between each spiral with a line. There are 700 points in each spiral, not something I want to set up manually. Can I write a macro that selects the chart, reads a pair of coordinates from each spiral and then draws the connecting line? I can see a FOR...NEXT loop as the outer control loop and reading the data with a Cells(row, col).Value statement. The selecting and drawing the line has me stumped.

 

[oldbrewer]

start small 2 straight lines of 3 plotted points join point 1 on top line with point 1 of bottom line

I race you !

 

[oldbrewer]

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[TD="colspan: 4"]custom line chart with two Y axes[/TD]
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[TD="colspan: 5"]I joined the 4 in week 1 with fred's 11 in week 2[/TD]
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[PLLman]

Sorry, don't quite understand your reply. I have a scatter plot showing two spirals with a bit of offset between them. I want to connect each point in one with a corresponding point in the other, and then do that for every subsequent point in the spirals. This creates a sort of twisting ladder effect. Now if I could only draw it.

 

[oldbrewer]

i deliberately started simple as i said - master that, switch to a two Y axis chart, and u will be nearer

and what does connect each point with a corresponding point mean

first point on spiral 1 woth first point on spiral 2 ?

 

[PLLman]

Ah! Now I understand what you are suggesting, and it is not what I was asking about. Let me set and example data set:

A B C D E
1 SPL1X SPL1Y SPL1X SPL1Y
2 0.01 1.00 0.03 1.015
3 0.02 0.95 0.05 1.001
4 0.04 0.92 0.08 0.96
5 0.08 0.87 0.14 0.82
. . . . .
. . . . .
. . . . .
800 30.707 -30.707 32.7 -32.72

This date set represents two spirals on an x-y scatter plot. The X-Y data for Spiral 1 is in columns A & B and the X-Y data for Spiral 2 is in columns D & E. There are about 800 points on each spiral (note last row number). They are plotted on Chart 4.

Now, I would like to draw ~800 line segments of two points from A*, B* to D*, E*; where * is a value between 2 and 800. I'd rather not copy this data to the worksheet to plot because each double pair of coordinates is itself a new data set on the chart each line with its own X data, requiring that each line be added INDIVIDUALLY. 800 times - no way! I am hoping that a macro could draw these lines using the data set in columns A - E.

Anyone??

 

[oldbrewer]

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[TD="colspan: 5"]I made ann X_Y scatter plot with only 2 points[/TD]
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[TD="colspan: 2"]2,5 and 3,9[/TD]
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[TD="colspan: 4"]I then joined the 2 with 9 further points[/TD]
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[TD="colspan: 7"]the small table on the right calculates x and y displacement needed[/TD]
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[TD="colspan: 5"]easy to increase the number of joining points until[/TD]
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[TD="colspan: 3"]they merge into a line[/TD]
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