Error using plot A numeric or double convertible argument is expected

Question

Carlos Antonio Hernández Guerrero 2019-3-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/447625-error-using-plot-a-numeric-or-double-convertible-argument-is-expected

评论： Walter Roberson 2019-3-4

Hello, I have this code, but i can't plot the variable Pw because it says "Error using plot,A numeric or double convertible argument is expected" but 've tried with ezplot, and stems and any of them fix the problem, what i have to do to plot Pw?

t=1e3:100:10e3;
syms p;
%x=-1510:1:1610;
%y=((x.^2)/(41)-1000);
%y1=y*-10;
w1=2e3;
w2=8e3;
A=10;
B=20;
g=parabola1;
%g1=EDFA;
z=100e-6;
%figure(3)
%plot(parabola1)
%fprintf(parabola1);
%axis([1300 1800 0 10e3])
figure(1)
f(t)=A*sin(w1*t)+B*cos(w2*t);
Pi=f(t);
plot(Pi)
figure(2)
%pione=EDFASinglePassGain_Analytical(Pi);
%stem(pione)
Pw=Pi.^(g*z);
plot(Pw)
%figure(4)
%Pw1=Pi.^g1*z;
%plot(Pw1)

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Answer 1

KSSV 2019-3-1

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链接

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https://ww2.mathworks.cn/matlabcentral/answers/447625-error-using-plot-a-numeric-or-double-convertible-argument-is-expected#answer_363280

编辑：KSSV 2019-3-1

YOu need to convert your sym varaible to double to plot. Read about double.

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Carlos Antonio Hernández Guerrero 2019-3-1

在 MATLAB Online 中打开

i changed the Pw to a double variable but with vpa, but now MATLAB showed me this

Error using inlineeval (line 14)
Error in inline expression ==>
matrix([[(-7254250567604507./281474976710656).^(x./10000),
(-3811115523678241./140737488355328).^(x./10000),
(-7522526733031939./281474976710656).^(x./10000),
(-3486834806029515./140737488355328).^(x./10000),
(-188433272412721./8796093022208).^(x./10000),
(-2388267933480667./140737488355328).^(x./10000),
(-6646677555354303./562949953421312).^(x./10000),
(-1795209592368153./281474976710656).^(x./10000),
(-322176506469167./281474976710656).^(x./10000),
(1942474664897181./562949953421312).^(x./10000),
(3952316566740705./562949953421312).^(x./10000),
(5216458947696533./562949953421312).^(x./10000),
(5628960268291825./562949953421312).^(x./10000),
(161102416862413./17592186044416).^(x./10000),
(3835077823765521./562949953421312).^(x./10000),
(889505247208845./281474976710656).^(x./10000),
(-105038029374677./70368744177664).^(x./10000),
(-7604662473915683./1125899906842624).^(x./10000),
(-6856582513936741./562949953421312).^(x./10000),
(-4871512010249943./281474976710656).^(x./10000),
(-6106634383741553./281474976710656).^(x./10000),
(-439088548699823./17592186044416).^(x./10000),
(-3772203188444611./140737488355328).^(x./10000),
(-3805883081124317./140737488355328).^(x./10000),
(-7211537042223109./281474976710656).^(x./10000),
(-6364988421280329./281474976710656).^(x./10000),
(-2564473601598027./140737488355328).^(x./10000),
(-448905090589489./35184372088832).^(x./10000),
(-931811828098223./140737488355328).^(x./10000),
(-145526725175301./562949953421312).^(x./10000),
(824992005200949./140737488355328).^(x./10000),
(6358352394513547./562949953421312).^(x./10000),
(2202702462215531./140737488355328).^(x./10000),
(327756962675233./17592186044416).^(x./10000),
(5642381163634457./281474976710656).^(x./10000),
(1395791605850521./70368744177664).^(x./10000),
(2543296614419323./140737488355328).^(x./10000),
(2104123776093727./140737488355328).^(x./10000),
(3034580024071739./281474976710656).^(x./10000),
(3351606308855437./562949953421312).^(x./10000),
(2054869364481081./2251799813685248).^(x./10000),
(-2185621130658317./562949953421312).^(x./10000),
(-8999409817804783./1125899906842624).^(x./10000),
(-3107100214119373./281474976710656).^(x./10000),
(-3582348854151071./281474976710656).^(x./10000),
(-3625099978839371./281474976710656).^(x./10000),
(-402590805499291./35184372088832).^(x./10000),
(-4783436202967157./562949953421312).^(x./10000),
(-2391814198997159./562949953421312).^(x./10000),
(69545826140407./70368744177664).^(x./10000),
(7673954683477679./1125899906842624).^(x./10000),
(1799235601471781./140737488355328).^(x./10000),
(2593684370976279./140737488355328).^(x./10000),
(1640198045386495./70368744177664).^(x./10000),
(7610810213320479./281474976710656).^(x./10000),
(2063675487555719./70368744177664).^(x./10000),
(4220833103902183./140737488355328).^(x./10000),
(2039235563864635./70368744177664).^(x./10000),
(1855751797120891./70368744177664).^(x./10000),
(3148876311573639./140737488355328).^(x./10000),
(4869788875504879./281474976710656).^(x./10000),
(6502516405023507./562949953421312).^(x./10000),
(3137482183038381./562949953421312).^(x./10000),
(-94010935525971./562949953421312).^(x./10000),
(-1471643898621289./281474976710656).^(x./10000),
(-2597325177496187./281474976710656).^(x./10000),
(-3341413072837167./281474976710656).^(x./10000),
(-3653154680266045./281474976710656).^(x./10000),
(-3517755377931993./281474976710656).^(x./10000),
(-1478763644364075./140737488355328).^(x./10000),
(-2030018190501933./281474976710656).^(x./10000),
(-3293092924962965./1125899906842624).^(x./10000),
(2205540645344577./1125899906842624).^(x./10000),
(984236037846971./140737488355328).^(x./10000),
(1649304260929071./140737488355328).^(x./10000),
(8838217168189743./562949953421312).^(x./10000),
(5224024542833205./281474976710656).^(x./10000),
(5632833228274845./281474976710656).^(x./10000),
(5597057285985191./281474976710656).^(x./10000),
(319017678527987./17592186044416).^(x./10000),
(2089623378715639./140737488355328).^(x./10000),
(1440952207322019./140737488355328).^(x./10000),
(1302635157810385./281474976710656).^(x./10000),
(-3560206840816129./2251799813685248).^(x./10000),
(-8934155240449147./1125899906842624).^(x./10000),
(-491456273362923./35184372088832).^(x./10000),
(-5414987530082513./281474976710656).^(x./10000),
(-6576097384616239./281474976710656).^(x./10000),
(-7333110979315203./281474976710656).^(x./10000),
(-7636333749706743./281474976710656).^(x./10000),
(-934027937906967./35184372088832).^(x./10000)]])
 Undefined function 'matrix' for input
arguments of type 'double'.
Error in inline/feval (line 33)
        INLINE_OUT_ =
        inlineeval(INLINE_INPUTS_,
        INLINE_OBJ_.inputExpr,
        INLINE_OBJ_.expr);
Error in ezplotfeval (line 51)
    z = feval(f,x(1));
Error in ezplot>ezplot1 (line 472)
    [y, f, loopflag] = ezplotfeval(f, x);
Error in ezplot (line 144)
                [hp, cax] = ezplot1(cax,
                f{1}, vars, labels, args{:});
Error in sym/ezplot (line 61)
   h = ezplot(fhandle(f));
Error in tarea2i1 (line 31)
ezplot(Pw)