conditional-statements

问题 i have a sequence of 1/0's indicating if patient is in remission or not, assume the records of remission or not were taken at discrete times, how can i check the markov property for each patient, then summarize the findings, that is the assumption that the probability of remission for any patient at any time depends only if the patient had remission the last time/not remission last time(same as thing as saying probability of remission for any patient at any time depends only if the patient

问题 i have a sequence of 1/0's indicating if patient is in remission or not, assume the records of remission or not were taken at discrete times, how can i check the markov property for each patient, then summarize the findings, that is the assumption that the probability of remission for any patient at any time depends only if the patient had remission the last time/not remission last time(same as thing as saying probability of remission for any patient at any time depends only if the patient

问题 I have a pandas dataframe and I need to create a new column based on an if-else condition. This question already came up here multiple times (e.g., Creating a new column based on if-elif-else condition). However, I cannot apply the proposed solution, since I also need to look up values in a list in order to check the condition. I cannot do this with the proposed solution, because I am not sure how I can access my lookup-list in the external function. My lookup-list would need to be global,

问题 I was wondering how can I asign a conditional assignment to a php variable and use it inside other conditional, like this: $cndtnal='&& $x==4' if($y==5 $cndtnal){ print 'Hello World'; } Thanks. 回答1: You should try avoiding the use of eval as much as possible, but if you want to use it, then you could do: $cndtnal='&& $x=4'; if($y==5 .eval("return '$cndtnal';") ){ echo 'Hello World'; } else { echo "this"; } 来源： https://stackoverflow.com/questions/12170527/php-variable-as-conditional-assignment

问题 General Information: Three reader-threads read randomly from a file in chunks where each chunk has an ID and they write to a normal ArrayList. A writer-thread writes to an outputfile as soon as a chunk with the needed ID is added to the list. For that reason I have written a BlockingChunkList which should synchronize the add() and getNextChunk() methods. It works for me with synchronized + notify + notifyAll in one case and with a synchronized list in another. I don't manage to do it when I

问题 So I declare a variable some where and initialize it. Now later on I need to use it to loop while its still positive so I need to decrement it. To me looping using a condition and a decrement calls for a for but for it we are missing the first part the initialization. But I don't need to initialize anything. So how do I go about that in a nice way. for (space = space; space > 0; space--)//my first way to do it but ide doesnt like it Second way: for (; space > 0; space--)//my friend

问题 I have a large matrix, z, that I removed all values >3 and replaced with NA using: z[z>3]<-NA I have another matrix, y , of identical dimensions that I need to replace values with NA in positions corresponding to the locations where the elements were replaced in element z. That is, if z[3,12] was >3 and replaced with NA, I need y[3,12] to be replaced with NA too. They have the same row names if that helps. 回答1: Just use is.na on the first matrix to select the values to replace in the second

问题 I was doing a simple calculator with the following code. Right now it executes perfectly. When I tried to change things around, however, it doesn't work. I used BOOL program to check whether to continue asking for input from the person or finish the program. If I change the expression of while statement to just (program) and change YES / NO in the program statements, why does the code fail to do what is inside the while ? // A simple printing calculator { NSAutoreleasePool * pool = [

问题 I have a quick question about which I did not find specific information on the web. I want to perform a Do...Loop Until loop, but I would like to insert more than one condition at the end. I would like to do: Do ' ...my code... Loop Until [Condition 1] And [Condition 2] And....And [Condition n]` Is this possible? Thank you very much in advance, Orlando 回答1: The below example shows lazy evaluation implementation: Do ' some operations Select Case False Case Condition1 Case Condition2 Case

问题 I cannot achieve to split an "if" condition over multiple lines in PowerShell WITH comments, see example: If ( # Only do that when... $foo # foo -and $bar # AND bar ) { Write-Host foobar } This generates the following error: Missing closing ')' after expression in 'if' statement. Adding the ` character does not work: If ( ` # Only do that when... $foo ` # foo -and $bar ` # AND bar ) { Write-Host foobar } I get a: Unexpected token '` # foo' in expression or statement. The only way I've found