请问下面这段代码中setnamed命令中的几个分别代表什么意思啊？

请问大家下面这段代码中setnamed命令中的几个分别代表什么意思啊？脚本运行的时候发现半径为0.25μm时可以正常运行，但为0.75μm的时候出现一个错误：
Warning: in run: there was no simulation data. The simulation failed to run.
Error:  Can not find result 'E' in the result provider 'field'
代码如下：
radius = 1e-6*[0.25,0.75];
for (i=1:length(radius)) {
    setnamed("::model","radius",radius(i));
    run;
    E = getresult("field","E");
    x = E.x;
    z = E.z;
    Ex = E.Ex;
    image(x*1e6,z*1e6,pinch(real(Ex)),"x (um)","z (um)","Real(Ex) - "+num2str(radius(i)*1e6)+" um");
    switchtolayout;
}

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