Error using fprintf Unable to convert 'sym' value to 'double'.

Question

Bernard Finik 2020-1-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/500819-error-using-fprintf-unable-to-convert-sym-value-to-double

回答： Walter Roberson 2020-1-18

fprintf(nru,'{ %.3f uta1 + %.2f uta2 = -%.2f\n',[UI1,SG13,SG12]);
fprintf(nru,'{ %.3f uta1 + %.2f uta2 = -%.2f\n\n',[SG13,UI2,SG23]);
fprintf(nru,'uta 1 = %.4g\n\n',xSoa);
fprintf(nru,'uta 2 = %.4g\n\n',ySob);
fprintf(nru,'V3 = 1/(pierwiastek(1 + %.4s^2 + %.4s^2)) = %.4s\n\n',[xSoa,ySob,V31]);
fprintf(nru,'V1 = %.4g * %.4g = %.4g\n\n',[xSoa,V31,V11]);
fprintf(nru,'V2 = %.4g* %.4g = %.4g\n\n',[ySob,V31,V21]);
fprintf(nru,'VL1= [ %.4g ; %.4g ; %.4g ]',VL1);

When i use '%s'

In my txt, i dont have any numbers.

"Error using fprintf

Unable to convert 'sym' value to 'double'.

Error in WXY4 (line 281)

fprintf(nru,'uta 1 = %.4g\n\n',xSoa);"

Please help.

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Answer 1

Walter Roberson 2020-1-18

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/500819-error-using-fprintf-unable-to-convert-sym-value-to-double#answer_410715

在 MATLAB Online 中打开

fprintf(nru,'{ %.3f uta1 + %.2f uta2 = -%.2f\n',[UI1,SG13,SG12]);
fprintf(nru,'{ %.3f uta1 + %.2f uta2 = -%.2f\n\n',[SG13,UI2,SG23]);
fprintf(nru,'uta 1 = %s\n\n', char(xSoa));
fprintf(nru,'uta 2 = %s\n\n', char(ySob));
fprintf(nru,'V3 = 1/(pierwiastek(1 + %s^2 + %s^2)) = %s\n\n', char(xSoa), char(ySob), char(V31));
fprintf(nru,'V1 = %s * %s = %s\n\n', char(xSoa), char(V31), char(V11));
fprintf(nru,'V2 = %s * %s = %s\n\n', char(ySob), char(V31), char(V21));
fprintf(nru,'VL1= [ %.4g ; %.4g ; %.4g ]',VL1);