环境：VS2017+MATLAB R2017a

①打开上次我们生成的BPClass.cs文件(目录：~//bin/BP/for_testing)，得在C#程序中引用生成的dll文件(目录：~//bin/BP/for_redistribution_files_only)

②Methods里面写了调用方法，并给出了详尽的注释(这里的numArgsOut是输出参数的数量，可以看注释)

/// /// Provides the standard 7-input MWArray interface to the BP MATLAB function.

///

/// /// M-Documentation:

/// 以下六行是BP网络最核心的程序

/// 他们是权值(阈值)依据能量函数负梯度下降原理所作的每一步动态调整量

///

/// The number of output arguments to return.

/// Input argument #1

/// Input argument #2

/// Input argument #3

/// Input argument #4

/// Input argument #5

/// Input argument #6

/// Input argument #7

/// An Array of length "numArgsOut" containing the output

/// arguments.

///

public MWArray[] BP(int numArgsOut, MWArray gdp, MWArray steelProduction, MWArray

autoProduction, MWArray highwayMileage, MWArray outputAmount, MWArray

outputMoney, MWArray forecast)

{

return mcr.EvaluateFunction(numArgsOut, "BP", gdp, steelProduction, autoProduction, highwayMileage, outputAmount, outputMoney, forecast);

}

因为MATLAB中定义的函数是这样子的：

function [输出变量] = 函数名称(输入变量)

function ForecastResult=BP(gdp,steelProduction,autoProduction,highwayMileage,outputAmount,outputMoney,forecast)

所以我是这样调用的：

for (int q = 0; q < 20; q++)

{

gdpPre[q] = arr[q, 0];

steelProductionPre[q] = arr[q, 1];

autoProductionPre[q] = arr[q, 2];

highwayMileagePre[q] = arr[q, 3];

outputAmountPre[q] = arr[q, 4];

outputMoneyPre[q] = arr[q, 5];

}

MWNumericArray gdp = gdpPre;

MWNumericArray steelProduction = steelProductionPre;

MWNumericArray autoProduction = autoProductionPre;

MWNumericArray highwayMileage = highwayMileagePre;

MWNumericArray outputAmount = outputAmountPre;

MWNumericArray outputMoney = outputMoneyPre;

MWNumericArray forecast = new MWNumericArray(4, 1, new double[] { Convert.ToDouble(GDPtextBox.Text.Trim()), Convert.ToDouble(steelProductiontextBox.Text.Trim()), Convert.ToDouble(autoProductiontextBox.Text.Trim()), Convert.ToDouble(highwayMileagetextBox.Text.Trim()) });

BP.BPClass function = new BP.BPClass();

MWArray[] result = function.BP(1, (MWArray)gdp, (MWArray)steelProduction, (MWArray)autoProduction, (MWArray)highwayMileage, (MWArray)outputAmount, (MWArray)outputMoney, (MWArray)forecast);

MWNumericArray x = (MWNumericArray)result[0];

double[,] y = new double[1, 2];

y = (double[,])x.ToArray(MWArrayComponent.Real);

MessageBox.Show("预测销售数量:" + Convert.ToDouble(y[0, 0].ToString()) + "万件,预测销售利润:" + Convert.ToDouble(y[0, 1].ToString()) + "万元.", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);