https://community.qlik.com/t5/QlikView/numerical-integration/m-p/1784979#M1209934 <P>Hello all,</P><P>I am getting to use numerical integration within the <U>trapezoidal rule</U>.</P><P>I already have the <STRONG>python function</STRONG> and would like to converting it to a <STRONG>QlikView macro</STRONG>.</P><P>The python function:</P><P><EM><STRONG>def trapz(f,a,b,N=20):</STRONG></EM></P><P><EM><STRONG>x=np.linspace(a,b,N+1)</STRONG></EM></P><P><EM><STRONG>y=f(x)</STRONG></EM></P><P><EM><STRONG>y_r=y[1:]</STRONG></EM></P><P><EM><STRONG>y_l=y[:-1]</STRONG></EM></P><P><EM><STRONG>dx=(b-a)/N</STRONG></EM></P><P><EM><STRONG>result=(dx/2)*np.sum(y_r+y_l)</STRONG></EM></P><P><EM><STRONG>return result</STRONG></EM></P><P>&nbsp;</P><P>As an example for input parameters: f(x)=exp(x)*x, a=0.1, b=0.8, N=20</P><P>&nbsp;</P><P>Can anyone help me?</P><P>Many thanks in advance</P> Mon, 22 Feb 2021 23:19:06 GMT AmCh 2021-02-22T23:19:06Z https://community.qlik.com/t5/QlikView/numerical-integration/m-p/1784979#M1209934 <P>Hello all,</P><P>I am getting to use numerical integration within the <U>trapezoidal rule</U>.</P><P>I already have the <STRONG>python function</STRONG> and would like to converting it to a <STRONG>QlikView macro</STRONG>.</P><P>The python function:</P><P><EM><STRONG>def trapz(f,a,b,N=20):</STRONG></EM></P><P><EM><STRONG>x=np.linspace(a,b,N+1)</STRONG></EM></P><P><EM><STRONG>y=f(x)</STRONG></EM></P><P><EM><STRONG>y_r=y[1:]</STRONG></EM></P><P><EM><STRONG>y_l=y[:-1]</STRONG></EM></P><P><EM><STRONG>dx=(b-a)/N</STRONG></EM></P><P><EM><STRONG>result=(dx/2)*np.sum(y_r+y_l)</STRONG></EM></P><P><EM><STRONG>return result</STRONG></EM></P><P>&nbsp;</P><P>As an example for input parameters: f(x)=exp(x)*x, a=0.1, b=0.8, N=20</P><P>&nbsp;</P><P>Can anyone help me?</P><P>Many thanks in advance</P> Mon, 22 Feb 2021 23:19:06 GMT https://community.qlik.com/t5/QlikView/numerical-integration/m-p/1784979#M1209934 AmCh 2021-02-22T23:19:06Z