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• Using scipy.interpolate.splrep function

  - by Koustav Ghosal

  I am trying to fit a cubic spline to a given set of points. My points are not ordered. I CANNOT sort or reorder the points, since I need that information. But since the function scipy.interpolate.splrep works only on non-duplicate and monotonically increasing points I have defined a function that maps the x-coordinates to a monotonically increasing space. My old points are: xpoints=[4913.0, 4912.0, 4914.0, 4913.0, 4913.0, 4913.0, 4914.0, 4915.0, 4918.0, 4921.0, 4925.0, 4932.0, 4938.0, 4945.0, 4950.0, 4954.0, 4955.0, 4957.0, 4956.0, 4953.0, 4949.0, 4943.0, 4933.0, 4921.0, 4911.0, 4898.0, 4886.0, 4874.0, 4865.0, 4858.0, 4853.0, 4849.0, 4848.0, 4849.0, 4851.0, 4858.0, 4864.0, 4869.0, 4877.0, 4884.0, 4893.0, 4903.0, 4913.0, 4923.0, 4935.0, 4947.0, 4959.0, 4970.0, 4981.0, 4991.0, 5000.0, 5005.0, 5010.0, 5015.0, 5019.0, 5020.0, 5021.0, 5023.0, 5025.0, 5027.0, 5027.0, 5028.0, 5028.0, 5030.0, 5031.0, 5033.0, 5035.0, 5037.0, 5040.0, 5043.0] ypoints=[10557.0, 10563.0, 10567.0, 10571.0, 10575.0, 10577.0, 10578.0, 10581.0, 10582.0, 10582.0, 10582.0, 10581.0, 10578.0, 10576.0, 10572.0, 10567.0, 10560.0, 10550.0, 10541.0, 10531.0, 10520.0, 10511.0, 10503.0, 10496.0, 10490.0, 10487.0, 10488.0, 10488.0, 10490.0, 10495.0, 10504.0, 10513.0, 10523.0, 10533.0, 10542.0, 10550.0, 10556.0, 10559.0, 10560.0, 10559.0, 10555.0, 10550.0, 10543.0, 10533.0, 10522.0, 10514.0, 10505.0, 10496.0, 10490.0, 10486.0, 10482.0, 10481.0, 10482.0, 10486.0, 10491.0, 10497.0, 10506.0, 10516.0, 10524.0, 10534.0, 10544.0, 10552.0, 10558.0, 10564.0, 10569.0, 10573.0, 10576.0, 10578.0, 10581.0, 10582.0] Plots: The code for the mapping function and interpolation is: xnew=[] ynew=ypoints for c3,i in enumerate(xpoints): if np.isfinite(np.log(i*pow(2,c3))): xnew.append(np.log(i*pow(2,c3))) else: if c==0: xnew.append(np.random.random_sample()) else: xnew.append(xnew[c3-1]+np.random.random_sample()) xnew=np.asarray(xnew) ynew=np.asarray(ynew) constant1=10.0 nknots=len(xnew)/constant1 idx_knots = (np.arange(1,len(xnew)-1,(len(xnew)-2)/np.double(nknots))).astype('int') knots = [xnew[i] for i in idx_knots] knots = np.asarray(knots) int_range=np.linspace(min(xnew),max(xnew),len(xnew)) tck = interpolate.splrep(xnew,ynew,k=3,task=-1,t=knots) y1= interpolate.splev(int_range,tck,der=0) The code is throwing an error at the function interpolate.splrep() for some set of points like the above one. The error is: File "/home/neeraj/Desktop/koustav/res/BOS5/fit_spline3.py", line 58, in save_spline_f tck = interpolate.splrep(xnew,ynew,k=3,task=-1,t=knots) File "/usr/lib/python2.7/dist-packages/scipy/interpolate/fitpack.py", line 465, in splrep raise _iermessier(_iermess[ier][0]) ValueError: Error on input data But for other set of points it works fine. For example for the following set of points. xpoints=[1629.0, 1629.0, 1629.0, 1629.0, 1629.0, 1629.0, 1629.0, 1629.0, 1629.0, 1629.0, 1629.0, 1629.0, 1629.0, 1629.0, 1629.0, 1629.0, 1630.0, 1630.0, 1630.0, 1631.0, 1631.0, 1631.0, 1631.0, 1630.0, 1629.0, 1629.0, 1629.0, 1628.0, 1627.0, 1627.0, 1625.0, 1624.0, 1624.0, 1623.0, 1620.0, 1618.0, 1617.0, 1616.0, 1615.0, 1614.0, 1614.0, 1612.0, 1612.0, 1612.0, 1611.0, 1610.0, 1609.0, 1608.0, 1607.0, 1607.0, 1603.0, 1602.0, 1602.0, 1601.0, 1601.0, 1600.0, 1599.0, 1598.0] ypoints=[10570.0, 10572.0, 10572.0, 10573.0, 10572.0, 10572.0, 10571.0, 10570.0, 10569.0, 10565.0, 10564.0, 10563.0, 10562.0, 10560.0, 10558.0, 10556.0, 10554.0, 10551.0, 10548.0, 10547.0, 10544.0, 10542.0, 10541.0, 10538.0, 10534.0, 10532.0, 10531.0, 10528.0, 10525.0, 10522.0, 10519.0, 10517.0, 10516.0, 10512.0, 10509.0, 10509.0, 10507.0, 10504.0, 10502.0, 10500.0, 10501.0, 10499.0, 10498.0, 10496.0, 10491.0, 10492.0, 10488.0, 10488.0, 10488.0, 10486.0, 10486.0, 10485.0, 10485.0, 10486.0, 10483.0, 10483.0, 10482.0, 10480.0] Plots: Can anybody suggest what's happening ?? Thanks in advance......

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• Default value for file path in function gives SyntaxError. Work around?

  - by LtPinback

  for this, import os.path def f(data_file_path=os.path.join(os.getcwd(),'temp'),type): ... return data I get this, SyntaxError: non-default argument follows default argument Is there a way to make this work or do I have to define a variable such as, rawdata_path = os.path.join(os.getcwd(),'temp') and then plug that into the function?

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• How can i obtain in C# a specific operator's function?

  - by Silviu

  Is it possible to obtain the function behind a C# operator? For example in F# you can do let add = (+);; val add : (int -> int -> int) Is it possible in c# to do something like this: Func<int, int, int> add = (+); or Func<int, int, int> add = Int32.(+) ?

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• What are the operations supported by raw pointer and function pointer in C/C++?

  - by yesraaj

  What are all operations supported by function pointer differs from raw pointer? Is , < , <= , =operators supported by raw pointers if so what is the use?

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• How can I define an anonymous generic Scala function?

  - by Geo

  Let's say I have this: val myAnon:(Option[String],String):String = (a:Option[String],def:String) => { return a.getOrElse(def) } Don't mind what the function does. Is there anyway of making it generic, so I can have an Option[T]?

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• VS 2010 SDK - Get function and class name when carret change, with c#.

  - by Fraga

  Hi experts. How can i get the name of the function and its class when the caret change position i a code file, using VS SDK 2010? I am using Editor Text Adornment template as an start and c#. Thanks.

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• Does the return value of a MATLAB function depend on how it's called?

  - by user198729

  A = imread(filename, fmt) [X, map] = imread(...) The above is in the synopsis part of imread, which seems to say that the return value of a MATLAB function depends on how it's called? Is that true?

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• SQL function to get count of how many times string appears in column?

  - by Kristopher Ives

  Is there a function for MySQL that will count the number of times a string occurs in another string or column? Basically I want: SELECT SUB_COUNT('my word', `my_column`) AS `match_count` FROM `table` Thanks!

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• In PHP :how can I use include() Function which parameter is variable ?

  - by Nina

  Hi.. I need to use include Function with variable. but,when I try to do it I faced some errors . Code : $year=$_POST['year']; $month=$_POST['month']; $day=$_POST['day']; include "Event.php?year=".$year."&month=".$month."&day=".$day; so,can U help me ? : )

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• How to get a name of a variable coming into a function as a parameter using F#?

  - by Oldrich Svec

  Is there any way in F# how to get a name of a variable passed into a function? Example: let velocity = 5 let fn v = v.ParentName let name = fn velocity // this would return "velocity" as a string Thank you in advance

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• R: Plotting a graph with different colors of points based on advanced criteria

  - by balconydoor

  What I would like to do is a plot (using ggplot), where the x axis represent years which have a different colour for the last three years in the plot than the rest. The last three years should also meet a certain criteria and based on this the last three years can either be red or green. The criteria is that the mean of the last three years should be less (making it green) or more (making it red) than the 66%-percentile of the remaining years. So far I have made two different functions calculating the last three year mean: LYM3 <- function (x) { LYM3 <- tail(x,3) mean(LYM3$Data,na.rm=T) } And the 66%-percentile for the remaining: perc66 <- function(x) { percentile <- head(x,-3) quantile(percentile$Data, .66, names=F,na.rm=T) } Here are two sets of data that can be used in the calculations (plots), the first which is an example from my real data where LYM3(df1) < perc66(df1) and the second is just made up data where LYM3 perc66. df1<- data.frame(Year=c(1979:2010), Data=c(347261.87, 145071.29, 110181.93, 183016.71, 210995.67, 205207.33, 103291.78, 247182.10, 152894.45, 170771.50, 206534.55, 287770.86, 223832.43, 297542.86, 267343.54, 475485.47, 224575.08, 147607.81, 171732.38, 126818.10, 165801.08, 136921.58, 136947.63, 83428.05, 144295.87, 68566.23, 59943.05, 49909.08, 52149.11, 117627.75, 132127.79, 130463.80)) df2 <- data.frame(Year=c(1979:2010), Data=c(sample(50,29,replace=T),75,75,75)) Here’s my code for my plot so far: plot <- ggplot(df1, aes(x=Year, y=Data)) + theme_bw() + geom_point(size=3, aes(colour=ifelse(df1$Year<2008, "black",ifelse(LYM3(df1) < perc66(df1),"green","red")))) + geom_line() + scale_x_continuous(breaks=c(1980,1985,1990,1995,2000,2005,2010), limits=c(1978,2011)) plot As you notice it doesn’t really do what I want it to do. The only thing it does seem to do is that it turns the years before 2008 into one level and those after into another one and base the point colour off these two levels. Since I don’t want this year to be stationary either, I made another tiny function: fun3 <- function(x) { df <- subset(x, Year==(max(Year)-2)) df$Year } So the previous code would have the same effect as: geom_point(size=3, aes(colour=ifelse(df1$Year<fun3(df1), "black","red"))) But it still does not care about my colours. Why does it make the years into levels? And how come an ifelse function doesn’t work within another one in this case? How would it be possible to the arguments to do what I like? I realise this might be a bit messy, asking for a lot at the same time, but I hope my description is pretty clear. It would be helpful if someone could at least point me in the right direction. I tried to put the code for the plot into a function as well so I wouldn’t have to change the data frame at all functions within the plot, but I can’t get it to work. Thank you!

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• Is it good to have a member template function inside a non-template class in c++?

  - by tsubasa

  I wonder if it is a good practice to have a member template function inside a non-template class in c++? Why?

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• In a C function declaration, what does "..." as the last parameter do?

  - by alaamh

  Often I see a function declared like this: void Feeder(char *buff, ...) what does "..." mean?

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• What does RETURN TRUE do in a php function?

  - by Imran

  I was just looking at this code and i don't understand what RETURN TRUE does or what the point of it is? Can someone please explain? class Elephpant { public $colour; public function dance() { echo "elephpant dances!\n"; return true; } } Thankyou in advance ;-)

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• In pure C how can i pass variable parameters into a function?

  - by fmsf

  Hey, How can i pass (and access) using C, not c++, variable parameters into a function? void foo(char* mandatory_param, char* optional_param, char* optional_param2...) thanks /fmsf

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• In pure C how can I pass a variable number of parameters into a function?

  - by fmsf

  Hey, How can i pass (and access) using C, not c++, variable parameters into a function? void foo(char* mandatory_param, char* optional_param, char* optional_param2...) thanks /fmsf

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• how to return 2 values from a java function?

  - by javaLearner.java

  Here is my code: // Function code public static int something(){ int number1 = 1; int number2 = 2; return number1, number2; } // Main class code public static void main(String[] args) { something(); System.out.println(number1 + number2); } Error: Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - missing return statement at assignment.Main.something(Main.java:86) at assignment.Main.main(Main.java:53) Java Result: 1

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• In pure C how can i pass multiple parameters into a function?

  - by fmsf

  Hey, How can i pass (and access) using C, not c++, multiple parameters into a function? void foo(char* mandatory_param, char* optional_param, char* optional_param2...) thanks /fmsf

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• Can someone explain the difference between these two typedefs? (Function pointer related)

  - by Quicksilver

  This one is quite obviously a function pointer : typedef int (* foobar) (int a, unsigned char *b, unsigned int c); But what does this one do? typedef int (foobar *) (int a, unsigned char *b, unsigned int c);

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• __proto__ of a function

  - by alter

  if I have a class called Person. var Person = function(fname, lname){ this.fname = fname; this.lname = lname; } Person.prototype.mname = "Test"; var p = new Person('Alice','Bob'); Now, p.proto refers to prototype of Person but, when I try to do Person.proto , it points to function(), and Person.constructor points to Function(). can some1 explain what is the difference between function() and Function() and why prototype of a Function() class is a function()

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• How to reference a particular JSON in a function call.

  - by Jane Wilkie

  Hi guys! I have two javascript routines.. the first one declares some JSON and it contains a function that takes two arguments, the first argument being the json object that needs traversing and the second argument is the tab that the rendering is done in. The second routine merely passes the name of the JSON that needs traversing and tab to render in. The code is below.... <script language="JavaScript1.2" type="text/javascript"> var arr = [ {"id":"10", "class":"child-of-9", "useless":"donotneed"}, {"id":"11", "class":"child-of-10", "useless":"donotneed"}]; var arrtwo = [ {"id":"12", "class":"child-of-12", "useless":"donotneed"}, {"id":"13", "class":"child-of-13", "useless":"donotneed"}]; function render_help(json,tab){ var html=''; for(var i=0;i<json.length;i++){ var obj = json[i]; for(var key in obj){ var attrName = key; var attrValue = obj[key]; if (attrName == "id"){ html = html +'<B>'+attrValue+'</B>'+'<BR><BR>'; }else if (attrName == "class"){ html = html + attrValue + '<BR><BR>'; } } } document.getElementById(tab).innerHTML=(html); } </script> <script language="JavaScript1.2" type="text/javascript"> render_help(arr,"helptab"); </script> Various testing and strategically placed alert boxes indicate that the tab parameter is being passed and interpreted correctly. I know this because when I change .... document.getElementById(tab).innerHTML=(html); to document.getElementById(tab).innerHTML=("Howdy"); and it renders "Howdy" just fine. Putting an alert box (alert(json)) in to check the value of json yields.... [object.Object],[object.Object] The JSON object remains elusive. For the purposes of this scripting I need the JSON "arr" to be iterated over. I feel like the answer is fairly obvious so far no luck. Admittedly I am new with Javascript and I am apparently missing something. Does anyone have a clue as to what I'm overlooking here? Happy New Year to you all! Janie

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• To delay javascript function call using jquery

  - by Mohan Ram

  CODES: $().ready(function(){ function sample() { alert("This is sample function"); } $("#button").click(function(){ t=setTimeout("sample()",2000); }); }); HTML: <input type="button" name="button" id="button" value="Call sample function with delay"> Once i click button sample function is not called with a delay of 2 seconds. I dont know whats wrong. Please notify me how to do this Question: To call javascript function using setTimeout via jquery

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• How can I send null value to clr function?

  - by Amit Cohen

  When I'm trying to create a clr fucntion with nullable paramete (any kind), the function does not created in the DB. Does anyone know how can I do it? thanks.

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• Simple Excel function that splits a numbered entered into one cell randomy and evenly over 3 others.

  - by Mike

  Hi all, I am looking for a simple function that will take a number entered into a single cell say 20 and divide it evenly and randomly over three other cells, none of the values can be 0. ie. A1 = 20 then B1=6 C1=8 D1=6 Thanks!!

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• What is this strange function definition syntax in C?

  - by Tom Dalling

  I've seen a few function definitions like this recently while playing with GNU Bison: static VALUE ripper_pos(self) VALUE self; { //code here } Why is the type of self outside of the parenthesis? Is this valid C?

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