#Take Log Scale For X Axis On Excel Series With Points#

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In Excel 2007, the axis can be achieved with the untransformed data.LOG function in excel is used to calculate the logarithm of a given number but the catch is that the base for the number is to be provided by the user itself, it is an inbuilt function which can be accessed from the formula tab in excel and it takes two arguments one is for the number and another is for the base.In the previous post, the data was widely spaced, so it filled a base 10 log scale with two decades with only a reasonable amount of space above and below the data.Get your scale of options in as column headers on row 1, starting from. In Excel 2003 it is necessary to transform the data to get the intended result. Values with the same X are meant to line up, so at 3 on the X axis.In Custom Axis, Y = 1, 2, 4, 8, 16 I showed axes with base 2 logarithmic scales in both Excel 20. Access syllabi, lecture content, assessments, and more from our network of college faculty.A common use of this in the business world is to overlay a line chart onto a bar.

Take Log Scale For X Axis On Excel Series With Points

Here the axis ranges from 8 to 80, still a decade on the base 10 log scale. Same as Excel 2003.Here the log scale has been changed to base 2.In 2007 we can change the min and max of the log axis to values other than 10 (i.e., other than the base). With such a narrow spread in the data, itвЂ™s not immediately apparent that the Y scale isnвЂ™t linear, but if you took out your ruler (you still have one of those, right? youвЂ™re not completely digital?) you can tell that the span between 8 and 9 is larger than that between 11 and 12.As described in Custom Axis, Y = 1, 2, 4, 8, 16, Excel 2007 makes working with log scales a bit easier.Here is the data plotted on a linear scale.Here is the same chart, with the scale transformed to a logarithmic scale, using the default base 10. The data is squeezed into the middle of the chart.Since Excel 2003 only permits the axis to begin and end at powers of ten, weвЂ™re stuck with this, and the fanciest labeling doesnвЂ™t make the data easier to read.Following the steps in Custom Axis, Y = 1, 2, 4, 8, 16 we can plot the logs of the data on a linear scale, from log(8) = 0.903 to log(12) = 1.079.We can hide the default labels, add a series with points where we want our custom labels using log(Y) data, and use the Y values as data labels.HereвЂ™s the chart. WeвЂ™ll look at this for Excel 2003 and for Excel 2007, and then weвЂ™ll look at native logarithmic axis labeling.The data in the table below has a narrow range, from 8 to 12, and the range spans a power of ten.Here is the data charted using a linear axis.When we apply a logarithmic scale axis, the data spans across 10, so by default the axis ranges from 1 to 100. Regression lines can be.If the data isnвЂ™t spread out so nicely, you lose the opportunity to use a regular logarithmic axis.

The advantage Excel 2007 has over 2003 is that we can use the actual values to locate the points, and we can simply use the Y value data label option. This looks the same using base 10 or base 2.We donвЂ™t get labels other than at the minimum because the axis spans less than a power of base 10 or of base 2, but we can use the same protocol as above to add points with data labels. Here the maximum is 12 to fit the data.

The the second axis, the bottom of the decade is at 0.1, so minor ticks are at 0.2, 0.3, 0.4, and so forth.In 2003, when the non-default major unit is used, the space between major tick marks is divided up as if it were a single cycle (not two or three. In our first axis below, the bottom of the decade is at 1, so minor ticks are at multiples of 1 (2, 3, 4, 5,вЂ¦). In the Excel 2007 chart above that used a base 10 log scale and ranged from 8 to 80, the minor ticks were at multiples of 8 (16, 24, 32, 40,вЂ¦). The minor tick spacing is ignored.If you use the default major unit, minor ticks are placed at multiples of the number at the start of the cycle. The third and fourth run from 1 to 1,000,000 like the first, but instead of the default major unit (major tick spacing) of 10, the third has a major unit of 100 and the fourth of 1000.

This puts the ticks at the very logical values of 10, 20, 30, etc.With larger spans between major ticks, Excel 2007 seems to get confused. The two cycle axis has the first minor tick where the first cycle ends and the next cycle starts, then the rest of the ticks are where they were defined for the second cycle. IвЂ™ve added labels to many of the minor ticks to help illustrate this behavior. The first pair of axes below show a scale of 1 to 100, first with the major unit defined by the default one cycle, then by two cycles. Interesting.Excel 2007 does this a bit differently, and for a two-cycle major unit, it makes sense. For a major unit of three cycles, the minor ticks are located at the cube of the one-cycle values, that is, at 8, 27, 64, etc.

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