dynamic

问题 So basically, I am a learning programmer and this week I was introduced to dynamic programming. Our task was to find the Fibonacci sequence using dynamic programming. This pseudo code was supplied which would obviously be in a function: init table to 0s if n ≤ 1 return n else if table[n-1] = 0 table[n-1] = dpFib(n-1) if table[n-2] = 0 table[n-2] = dpFib(n-2) table[n] = table[n-1] + table[n-2] return table[n] The majority of this was simple to change to code but I'm not sure how to initialise

问题 Within my XSLT spreadsheet, I need to define an xsl:variable with one value or another depending on the value of an xml node. The code just below shows what I'm trying to do. I would like to define multiple variables this way. A major issue is that in order to choose a variable value based on the node value of each item, the choosing must be done within xsl:foreach, and whenever I try to define a variable within xsl:foreach it shows an error. <xsl:for-each select="WORKS/item"> <xsl:variable

问题 Within my XSLT spreadsheet, I need to define an xsl:variable with one value or another depending on the value of an xml node. The code just below shows what I'm trying to do. I would like to define multiple variables this way. A major issue is that in order to choose a variable value based on the node value of each item, the choosing must be done within xsl:foreach, and whenever I try to define a variable within xsl:foreach it shows an error. <xsl:for-each select="WORKS/item"> <xsl:variable

问题 I am studying up on my Java Programming and Object Oriented Programming. I keep getting hung up on what the benefit of Dynamic Polymorphism is? Take a look at my sample program below. Why would I use example 1 over example 2? class SuperHero { private String power = ("Generic Power"); public void useSuperPower() { System.out.println(power); } } class Spiderman extends SuperHero { private String power = ("Web sling!"); public void useSuperPower() { System.out.println(power); } } class

问题 I want to use a registry as a column name but the registry is variable and I don't know when it changes. Example: Config (field) = 'Medicine' FieldContent (another field) = 'Remedy name' A want to make this: Medicine (use content of Config as column name) = 'Remedy Name' (as registry) What have I tried? SET @CONFIG = SELECT CONFIG; SELECT FIELDCONTENT AS @CONFIG FROM TABLENAME; MySql says that I can't use a variable as column name. There's other way? actual Config Content Medicine RemedyName

问题 I want to pivot a table based on a field which can contain "dynamic" values (not always known beforehand). I can make it work by hard coding the values (which is undesirable): SELECT * FROM my_table pivot(SUM(amount) FOR type_id IN (1,2,3,4,5,20,50,83,141,...); But I can't make it work using a query to provide the values dynamically: SELECT * FROM my_table pivot(SUM(amount) FOR type_id IN (SELECT id FROM types); --- 090150 (22000): Single-row subquery returns more than one row. SELECT * FROM

问题 I want to pivot a table based on a field which can contain "dynamic" values (not always known beforehand). I can make it work by hard coding the values (which is undesirable): SELECT * FROM my_table pivot(SUM(amount) FOR type_id IN (1,2,3,4,5,20,50,83,141,...); But I can't make it work using a query to provide the values dynamically: SELECT * FROM my_table pivot(SUM(amount) FOR type_id IN (SELECT id FROM types); --- 090150 (22000): Single-row subquery returns more than one row. SELECT * FROM

问题 i understand that to create dynamic for loops, recursive or itertools module in python is the way to go. Lets say I am doing it in recursive. What I want is for var1 in range(var1_lowerlimit, var1_upperlimit, var1_stepsize): for var2 in range(var2_lowerlimit, var2_upperlimit, var2_stepsize): : : # do_whatever() repeat for n loops where n is the number of variables What I have now is I have 2 lists variable_list = [ var1, var2, var3, ... ] boundaries_list = [ [var1_lowerlimit, var1_upperlimit,

问题 How do I take a vector of function argument AST variants, extract the values, and use them to instantiate a function call? I am writing an interpreter that evaluates certain expressions. Some of the expressions are function calls. I am having a hard time figuring out how to translate the function calls AST to the actual call. The AST gives me the function name and a vector of arguments. I can lookup the function pointer to call from the name using a map, but passing the arguments to the

问题 Dynamic components were loading absolutely fine in Angular 8. Once a component is loaded, Detach and Interest of components was also working fine. I am using ng-three-template. loadComponent(componentID: number, component: any) { this.viewContainerRef.detach(); if( this.componentFactory[componentID] == undefined ) { this.componentFactory[componentID] = this.componentFactoryResolver.resolveComponentFactory( component ); this.componentRef[componentID] = this.viewContainerRef.createComponent(