r - customized "scale_color_gradient2" in ggplot2 -


i use own specific color in image plot. new in ggplot2 had @ manual here , tried repeat of stuff; couldn't figure out how supply colorbar did graphics plot.

library(reshape2) library(ggplot2)  #my specific color list mycol <- vector(length=512, mode = "numeric") (k in 1:256) mycol[k] <- rgb(255, k - 1, k - 1, maxcolorvalue=255) (k in 257:512) mycol[k] <- rgb(511 - (k - 1), 511 - (k - 1), 255, maxcolorvalue=255) mycol <- rev(mycol) ncolors <- length(mycol)  # graphics plot par(mar = c(5, 13, 1, 6)) image(1:ncol(volcano), 1:nrow(volcano), t(volcano), zlim = c(0, ncolors), col=mycol, axes=false, main="w matrix", sub = "", xlab= "components", ylab="genes") axis(2, at=1:nrow(volcano), labels=row.names(volcano), adj= 0.5, tick=false, las = 1, cex.axis=0.25, font.axis=1, line=-1) axis(1, at=1:ncol(volcano), labels=colnames(volcano), adj= 0.5, tick=false,las = 3, cex=1, cex.axis=0.5, font.axis=1, line=-1)   # ggplot2 library(reshape2) library(ggplot2) library(ez) ggplot(melt(volcano), aes(x=var1, y=var2, fill=value)) + geom_tile() + scale_color_gradient2(low = muted("red"), mid = "white", high = muted("blue"), midpoint = 0, space = "rgb", guide = "colourbar") # code not use color bar

*error in unit(tic_pos.c, "mm") : 'x' , 'units' must have length > 0*

just clarify @didzis' answer, works may not produce gradient you're looking for...

'midpoint' refers numerical value @ want color specified 'mid' appear. so, instead of setting 'midpoint' argument 256 (which falls outside range of value, vector you're coloring by), it's wise set value somewhere in middle of range of values coloring by, otherwise aren't using entire gradient specified 'low' , 'high', defeats purpose of scale_color_gradient2. exact value depends on trying communicate visually, mean or median used. here, edited @didzis' code 'midpoint' set median of value

v <- melt(volcano) ggplot(v, aes(x=var1, y=var2, fill=value)) +    geom_tile() +    scale_fill_gradient2(low = "#0000ff", mid = "#ffffff", high ="#ff0000",                         midpoint = median(v$value), space = "rgb", guide = "colourbar")

this gives plot wider gradient:

enter image description here


Comments

Post a Comment

Popular posts from this blog

php - get table cell data from and place a copy in another table -

two-part question: have 2 tables: 1 table items , other table selected items copied when add button clicked. after, when items wanted selected, there 'finished' button post items selected db. i started javascript didn't far @ because jquery seems better suited i'm not familiar it function addto() { var div = document.getelementbyid('fixeddiv','inside'); div.innerhtml = div.innerhtml + 'item added'; } <div id='fixeddiv'> <table align="center" id="tradee"> <th rowspan="2"> other item</th> <?php while($rowi =$item->fetch_assoc()) {?> <tr> <td> <?php echo $rowi['item_name']; ?> </td> <td><?php echo $rowi['item_description'];?></td> </tr> <?php } ?> </table> <br> <table align="center" id="tradetable"
Read more

javascript - Mootools wait with Fx.Morph start -

i trying var effect = new fx.morph(testmorph, { wait/delay 2 seconds before starting. ( fiddle here ) but when try .wait(2000) or .delay(2000) , or .wait(2000, effect) uncaught typeerror: object [object object] has no method 'delay' any ideas how working? code i'm using: var testmorph = document.id('testmorph'); var effect = new fx.morph(testmorph, { transition: 'back:out', duration: 900, link: 'chain' }).start({ 'top': 20, 'opacity': 1 }).start({ 'border-color': '#a80025', 'color': '#a80025' }); effect.delay(2000); you can use combination of chain() , delay() achieve desired effect. new fx.morph(testmorph, { transition: 'back:out', duration: 900, link: 'chain' }).start().chain(function(){ this.start.delay(2000,effect,{ //first }); }).chain(function(){ this.start({ //second }); }); the
Read more

php - Navigate throught databse rows -

i run image hosting site, , ive run problem. want make 2 buttons beside pic "next image" , "prev image". im new php/mysql , haveing troubles. check out got. use id (numbers) find correct row, have image name build next link. how make below query next , prev image names + ids? $query_next = ("select imageid, image_name images image_name = '$image_main' order imageid desc limit 1"); $query_prev = ("select imageid, image_name images image_name = '$image_main' order imageid asc limit 1"); // next $next = mysql_query($query_next); // prev $prev = mysql_query($query_prev); while ($row = mysql_fetch_assoc($next)) { $next = $row['image_name']; } while ($row = mysql_fetch_assoc($prev)) { $prev = $row['image_name']; } the html = > simple stuff. <a href="http://mysite.com/view_image/<?=$next?>">next image</a> <a href="http://mysite.com/view_image/<?=$pr
Read more