.NET/ASP.NET/C#/VB.NET PDF Document SDK

6; 4; 1|]; 10; 10; 5; 1|]; 15; 20; 15; 6; 1|]; 21; 35; 35; 21; 7; 1|]; 28; 56; 70; 56; 28; 8; 1|];

Listing 13-6. Read4 program #define port S1 // sensor port 1 #define I2CAddr8591 0x90 // PCF8591 address byte WriteBuf[] = {I2CAddr8591, 0x04}; // write buffer byte ReadBuf[]; // read buffer int RdCnt=5; // read 5 bytes task main(){ SetSensorLowspeed(port); // make port I2C while(true){ // Write config byte and read back 5 bytes I2CBytes(port, WriteBuf, RdCnt, ReadBuf); NumOut(0,24,ReadBuf[1],true); // Chan 0 NumOut(0,16,ReadBuf[2]); // Chan 1 NumOut(0,8,ReadBuf[3]); // Chan 2 NumOut(0,0,ReadBuf[4]); // Chan 3 } }

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If you simply set a breakpoint within the iteration, execution will be suspended each time that line of code is encountered, and you ll have to manually restart the execution each time until you get to the item within the list in which you re interested In this example, the list isn t very long, but if the list were several hundred items long, it would be convenient to halt execution only when a certain condition is met..

Then create a rectangular array that contains various number sequences that are hidden within pascalsTriangle: let numbers = let length = (Array.length pascalsTriangle) in let temp = Array2.create 3 length 0 in for index = 0 to length - 1 do let naturelIndex = index - 1 in if naturelIndex >= 0 then temp.[0, index] <- pascalsTriangle.[index].[naturelIndex]; let triangularIndex = index - 2 in if triangularIndex >= 0 then temp.[1, index] <- pascalsTriangle.[index].[triangularIndex]; let tetrahedralIndex = index - 3 in if tetrahedralIndex >= 0 then temp.[2, index] <- pascalsTriangle.[index].[tetrahedralIndex] done temp Then display the sequences you ve retrieved: print_any numbers The results of this example, when compiled and executed, are as follows: [|[|0; 1; 2; 3; 4; 5; 6; 7; 8|]; [|0; 0; 1; 3; 6; 10; 15; 21; 28|]; [|0; 0; 0; 1; 4; 10; 20; 35; 56|]|] The following shows the types displayed when you use the compiler s i switch: val pascals_triangle : int array array val numbers : int [,] As you may expect, jagged and rectangular arrays have different types. The type of a jagged array is the same as a single-dimensional array, just with an array per dimension, so the type of pascalsTriangle is int array array. Rectangular arrays use a more C#-style notation. First comes the name of the type of the array s elements, and after that comes square brackets ([]) with one comma for every dimension greater than 1, so the type of the example twodimensional numbers array is int[,].

Way back in 5 you learned how to build a light-seeking robot called the Braitenberg Vehicle that required two separate Light Sensors and two NXT sensor ports. Then in 8 we combined two Light Sensors into a single Differential Light Sensor that only needed a one NXT port. Now let s see how to use the four analog inputs of the PCF8591 to build a light-seeking vehicle that will move toward bright light regardless of its direction. Figure 13-35 shows just the part of the circuit with four Light Dependent Resistors (LDRs) and their pull-up resistors. The rest of the circuit is built like Figure 13-31 with R3-R6 removed. The four LDRs share a common connection to the AGND input of the PCF8591 and, through 10k pull-ups, to VREF.

I Caution To write code that is compatible with both .NET 1.1 and 2.0, you must use the Microsoft. FSharp.Compatibility namespace s CompatArray and CompatMatrix types. This is because of differences in the way that arrays behave in different .NET versions. In .NET 1.1, arrays are pseudogeneric, because you can create arrays of different types as though they were generic; however, they are not really generic, since .NET 1.1 doesn t support generics. In .NET 2.0, arrays became properly generic, and their behavior changed in a number of subtle ways that F# cannot abstract away. The result is that you must explicitly choose whether you want to use arrays that are supported in .NET 1.1.