r - Evaluate dnorm for multiple parameter values and the same argument -


i trying accomplish same in this post, namely overlaying multiple histrograms densities. solution in referred post works, made me wonder if calculation of dfn can done newer packages purrr/purrrlyr:

set.seed(1) df <- data.frame(bsa=rnorm(200, mean=rep(c(1,4),each=100)),                   group=rep(c("test","control"),each=100))  stats <- df %>% group_by(group) %>% summarise(m = mean(bsa), sd = sd(bsa)) x <- with(df, seq(min(bsa), max(bsa), len=100))  dfn <- do.call(rbind,lapply(1:nrow(stats),                              function(i) with(stats[i,],data.frame(group, x, y=dnorm(x,mean=m,sd=sd)))))

to perform inner lapply part, have been trying stuff along lines of

stats %>%     dplyr::group_by(group) %>%     purrr::map(x, dnorm, m, sd)

that is, passing on m , sd stats , using same x. unfortunately, doesn't work. (once inner part accomplished, can pass on result do.call, not problem).

if go dplyr, think don't need compute stats nor x separately. i'd do:

dfn_2 <-   df %>%    mutate_at(vars(bsa), funs(min, max)) %>%    arrange(group) %>%    group_by(group) %>%    transmute(     x = seq(first(min), first(max), length.out = n()),      y = dnorm(x, mean(bsa), sd(bsa))   ) %>%    as.data.frame()  all.equal(dfn, dfn_2) # [1] true

alternatively, here 2 approaches not recommend. demonstrate possible, , how have done trying:

dfn_3 <-   stats %>%    split(.$group) %>%    map2_df(names(.), ~ tibble(group = .y, x, y = dnorm(x, .x$m, .x$sd)))  # # tibble: 200 x 3 #      group         x            y #      <chr>     <dbl>        <dbl> #  1 control -1.888921 6.490182e-09 #  2 control -1.809524 1.045097e-08 #  3 control -1.730128 1.672139e-08 #  4 control -1.650731 2.658301e-08 #  5 control -1.571334 4.199062e-08 #  6 control -1.491938 6.590471e-08 #  7 control -1.412541 1.027772e-07 #  8 control -1.333145 1.592550e-07 #  9 control -1.253748 2.451917e-07 # 10 control -1.174352 3.750891e-07 # # ... 190 more rows  all.equal(dfn, as.data.frame(mutate_at(dfn_3, vars(group), as.factor))) # [1] true   dfn_4 <-   stats %>%    group_by(group) %>%    transmute(x = list(x), y = map(x, dnorm, m, sd)) %>%    ungroup() %>%    tidyr::unnest()  # # tibble: 200 x 3 #      group         x            y #     <fctr>     <dbl>        <dbl> #  1 control -1.888921 6.490182e-09 #  2 control -1.809524 1.045097e-08 #  3 control -1.730128 1.672139e-08 #  4 control -1.650731 2.658301e-08 #  5 control -1.571334 4.199062e-08 #  6 control -1.491938 6.590471e-08 #  7 control -1.412541 1.027772e-07 #  8 control -1.333145 1.592550e-07 #  9 control -1.253748 2.451917e-07 # 10 control -1.174352 3.750891e-07 # # ... 190 more rows  all.equal(dfn, as.data.frame(dfn_4)) # [1] true

Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj...
Read more

performance - Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? -

i'm doing micro-optimization on performance critical part of code , came across sequence of instructions (in at&t syntax): add %rax, %rbx mov %rdx, %rax mov %rbx, %rdx i thought had use case xchg allow me shave instruction , write: add %rbx, %rax xchg %rax, %rdx however, dimay found agner fog's instruction tables , xchg 3 micro-op instruction 2 cycle latency on sandy bridge, ivy bridge, broadwell, haswell , skylake. 3 whole micro-ops , 2 cycles of latency! 3 micro-ops throws off 4-1-1-1 cadence , 2 cycle latency makes worse original in best case since last 2 instructions in original might execute in parallel. now... cpu might breaking instruction micro-ops equivalent to: mov %rax, %tmp mov %rdx, %rax mov %tmp, %rdx where tmp anonymous internal register , suppose last 2 micro-ops run in parallel latency 2 cycles. given register renaming occurs on these micro-architectures, though, doesn't make sense me done way. why wouldn't register renamer ...
Read more

c# - Asp.net web api : redirect unauthorized requst to forbidden page -

im trying redirect unauthorized request forbidden page instead i'm getting forbidden page in response body , how can fix ? here's startup class : app.createperowincontext(storecontext.create); app.createperowincontext<applicationusermanager>(applicationusermanager.create); app.createperowincontext<applicationsigninmanager>(applicationsigninmanager.create); app.usecookieauthentication(new cookieauthenticationoptions { authenticationtype = defaultauthenticationtypes.applicationcookie, expiretimespan = timespan.fromdays(30), }); app.useexternalsignincookie(defaultauthenticationtypes.externalcookie); app.usetwofactorsignincookie(defaultauthenticationtypes.twofactorcookie, timespan.fromminutes(5)); app.usetwofactorrememberbrowsercookie(defaultauthenticationtypes.twofactorrememberbrowsercookie); the method im trying reach : [httpget] [authorize(roles = "admin")] public string getcurrentusername() { return userman...
Read more