map

问题 I am learning topojson with d3. I have coordinate information for land, which is rendered correctly. Then, how can I add color to ocean (basically outside land)? I tried coloring graticule, but doesn't fill up the entire map and leaves empty spots. The visualization is hosted on http://jbk1109.github.io/ var projection = d3.geo.stereographic() .scale(245) .translate([width / 2, height / 2]) .rotate([-20, 0]) .clipAngle(180 - 1e-4) .clipExtent([[0, 0], [width, height]]) .precision(.1); var

问题 I want to find a key in a map that is similar to a specific text. should I use for loop or is there a more elegant way? 回答1: The direct translation of your question is map.keys.find(_.matches(pattern)) which given a map, gets they keys and finds the first key that matches the regexp pattern. val map = Map("abc" -> 1, "aaa" -> 2, "cba" -> 3) map.keys.find(_.matches("abc.*")) // Some(abc) map.keys.find(_.matches("zyx")) // None A loop may be counter productive if you don't want to scan all keys

问题 Go has very neat multiple return values paradigm. But It looks like v, ok := map[key] and v, k := range m use different mechanism with same notation. Here is a simple example: func f2() (k, v string) { return "Hello", "World" } func main(){ k := f2() // Doesn't work : multiple-value f2() in single-value context m := map[string]int{"One": 1} // It works v, ok := m["One"] // How it all work? v := m["One"] for k := range m {} } In above example, k := f2() gives error as f2 returns two values,

问题 I have the declaration (or similar) std::map< std::string, Stock*> &stocks; throughout my code. Eclipse does not like this and produces a "Invalid template arguments" error. Stock is declared as: class Stock { public: Stock(std::string, qbbo::Financial_status_indicator, qbbo::Security_class, qbbo::Current_trading_state, qbbo::Market_category, qbbo::Reg_sho_action); ~Stock(); void setFinancialStatusIndicator(qbbo::Financial_status_indicator financialStatusIndicator); void setSecurityClass(qbbo

问题 It's my first time trying out C++ STL. I'm trying to build a multidimensional associative array using map. For example: typedef struct DA { string read_mode; string data_type; void *pValue; void *pVarMemLoc; }DA; int main() { map<string, map<string, map<string, map<string, map<string, DA*>>>>> DATA; DATA["lvl1"]["stg1"]["flr1"]["dep1"]["rom1"] = new DA; DATA["lvl1"]["stg1"]["flr1"]["dep1"]["rom2"] = new DA; DATA["lvl1"]["stg1"]["flr1"]["dep1"]["rom3"] = new DA; IEC["lvl1"]["stg1"]["flr1"][

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 7 years ago . i have one building map and it have so many rooms on it. Now i want to drop the pin in that building map, where the user is being in that building and also i want to draw the direction if user want to navigate to

问题 I am using the eclipse IDE and I just exported my project using 'export->Runnable Jar'. In my code, I have loaded a map using URL map1url = this.getClass().getResource("map01.txt"); and later inputmap = new File(map1url.getFile()); and then scanned its data using Scanner sc = null; try { sc = new Scanner(inputmap); } catch (FileNotFoundException e) { e.printStackTrace(); } Now, when I package the map01.txt into the jar, and double click it, it runs, but can't find the map01.txt. When I use

问题 All - I'm trying to understand the first section of the Map file produced by the MS Visual Studio 2005 linker. I know it has something to do with memory sections, but can someone help me decipher it? Timestamp is 4b4f8d2b (Thu Jan 14 14:31:23 2010) Preferred load address is 00400000 Start Length Name Class 0001:00000000 0028b752H .text CODE 0002:00000000 000001b4H .idata$5 DATA 0002:000001b4 00000004H .CRT$XCA DATA 0002:000001b8 00000004H .CRT$XCAA DATA 0002:000001bc 00000004H .CRT$XCC DATA

问题 I’d like to skip results that are returned from map_async. They are growing in memory but I don’t need them. Here is some code: def processLine(line): #process something print "result" pool = Pool(processes = 8) for line in sys.stdin: lines.append(line) if len(lines) >= 100000: pool.map_async(processLine, lines, 2000) pool.close() pool.join() When I have to process file with hundreds of millions of rows, the python process grows in memory to a few gigabytes. How can I resolve that? Thanks for

问题 I’d like to skip results that are returned from map_async. They are growing in memory but I don’t need them. Here is some code: def processLine(line): #process something print "result" pool = Pool(processes = 8) for line in sys.stdin: lines.append(line) if len(lines) >= 100000: pool.map_async(processLine, lines, 2000) pool.close() pool.join() When I have to process file with hundreds of millions of rows, the python process grows in memory to a few gigabytes. How can I resolve that? Thanks for