How to adjust scale manually and how to increase the size of the legend? (geom_tile)

[Roland B]

Hello,

I am quiet new to ggplot2 and I have some small problems which google could not solve ;-)

This is the basic code I use:

ggplot(x, aes(x, y)) + geom_tile(aes(fill = z), colour =   "white") + scale_fill_gradient(low
= "white", high = "black", name = "Absolute
\nHäufigkeit")

Frist I have the problem that I need to do several of this graphs and they should all have the same maxima at the legend.
At the moment somtimes the top value of the legend is maybe 8 or 15 depending on the data.
Therefore I would like so set the scale manually to for example 15 that one can compare the graphs more easily having the same legend.

Second I would like to increase the size of the legend. I just found out that I could use " + guides(fill = guide_legend(keyheight = 3))" for that.
But if I do so the type of the legend is also changing and I would like to remain the continious gradient scale.


Thank you very much for your help :-)

[Ista Zahn]

Hi Roland,

On Thu, Sep 4, 2014 at 11:11 AM, Roland B <rolm...@gmail.com> wrote:

Hello,

I am quiet new to ggplot2 and I have some small problems which google could not solve ;-)

This is the basic code I use:

ggplot(x, aes(x, y)) + geom_tile(aes(fill = z), colour =   "white") + scale_fill_gradient(low
= "white", high = "black", name = "Absolute
\nHäufigkeit")

Frist I have the problem that I need to do several of this graphs and they should all have the same maxima at the legend.
At the moment somtimes the top value of the legend is maybe 8 or 15 depending on the data.
Therefore I would like so set the scale manually to for example 15 that one can compare the graphs more easily having the same legend.

​use scale_fill_gradient(limits = range(x$z, na.rm=TRUE) ...)​

 

Second I would like to increase the size of the legend. I just found out that I could use " + guides(fill = guide_legend(keyheight = 3))" for that.
But if I do so the type of the legend is also changing and I would like to remain the continious gradient scale.

​use + guides(fill = guide_colorbar(barheight = 3))​

​Best,
Ista​

 

Thank you very much for your help :-)

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[Roland B]

Hi Ista,

thank you very much.
Everything works well :-)