Customizing tick marks and labels on x-axis (Excel VBA) - vba

I'm drawing a graph in Microsoft Excel and I'm just wondering if this is possible, and if it is, how to achieve it. I've attached an illustration below:
This is what I have >
regular
This is what I'm trying to do > (I did this in Paint to illustrate)
edited in paint
Can the y-axis to cross over the x-axis at 30, but the tick marks starts at 100 onwards? I also don't want any labeling or tick marks below 30.
Thank you.


You need to hide the default axis and build your own. In my example, I want the axis to start at 30 and end at 730, but have tick marks and labels at 100, 200, 300, etc.
I set up a data range with X values in one column of 100, 200, 300, ... 700, and Y values of zero in the next column.
Chart 1 is the original chart without anything added or removed. Chart 2 has the added series, shown as orange plus-sign markers. Chart 3 has data labels below these added points, showing the default Y values of zero (orange text). In Chart 4 I have formatted the labels so that they show the X values instead of the Y values. In Chart 5 I have changed the X axis scale so it starts at 30 and ends at 730. I have also hidden the axis labels, not by removing them, but my using a custom number format of " ", which preserves the margin below the axis to leave room for my custom data labels. Finally in Chart 6 I have formatted the plus sign markers to match the axis line and the data labels to match the other chart text. I have also formatted the Y axis with major tick marks that cross the axis.


First two are basic chart formatting - plenty of examples to be found via Google for those.
For the third one you can use a custom format for your axis labels. See for example:
http://www.officetooltips.com/excel_2016/tips/conditional_formatting_of_chart_axes.html
Your format could look something like this:
[White][<=30]General;[Black][>30]General
In VBA:
With ActiveSheet.ChartObjects(1).Chart.Axes(xlCategory)
.TickLabels.NumberFormat = "[White][<=30]General;[Black][>30]General"
End With

Related

why is ggplot2 geom_col misreading discrete x axis labels as continuous?

Aim: plot a column chart representing concentration values at discrete sites
Problem: the 14 site labels are numeric, so I think ggplot2 is assuming continuous data and adding spaces for what it sees as 'missing numbers'. I only want 14 columns with 14 marks/labels, relative to the 14 values in the dataframe. I've tried assigning the sites as factors and characters but neither work.
Also, how do you ensure the y-axis ends at '0', so the bottom of the columns meet the x-axis?
Thanks
Data:
Sites: 2,4,6,7,8,9,10,11,12,13,14,15,16,17
Concentration: 10,16,3,15,17,10,11,19,14,12,14,13,18,16

You have two questions in one with two pretty straightforward answers:
1. How to force a discrete axis when your column is a continuous one? To make ggplot2 draw a discrete axis, the data must be discrete. You can force your numeric data to be discrete by converting to a factor. So, instead of x=Sites in your plot code, use x=as.factor(Sites).
2. How to eliminate the white space below the columns in a column plot? You can control the limits of the y axis via the scale_y_continuous() function. By default, the limits extend a bit past the actual data (in this case, from 0 to the max Concentration). You can override that behavior via the expand= argument. Check the documentation for expansion() for more details, but here I'm going to use mult=, which uses a multiplication to find the new limits based on the data. I'm using 0 for the lower limit to make the lower axis limit equal the minimum in your data (0), and 0.05 as the upper limit to expand the chart limits about 5% past the max value (this is default, I believe).
Here's the code and resulting plot.
library(ggplot2)
df <- data.frame(
Sites = c(2,4,6,7,8,9,10,11,12,13,14,15,16,17),
Concentration = c(10,16,3,15,17,10,11,19,14,12,14,13,18,16)
)
ggplot(df, aes(x=as.factor(Sites), y=Concentration)) +
geom_col(color="black", fill="lightblue") +
scale_y_continuous(expand=expansion(mult=c(0, 0.05))) +
theme_bw()

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Before
After

The data points are exactly where they should be. The only thing that has changed is the range of values that is displayed on each axis.
--> this range is now significationly lower because only one set of data is represented by each axis, before, one axis had to scale large enough to display both datasets.
I suggest you read the documentation of the YAxis and simply increase the range of values that should be displayed on the axis.

while plotting y2 axis providing the x values is the problem. values for the x axis should be provide for single time. providing twice add the values to x axis exiting values get doubled.
thnx #philipp

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