Getting A Blank Plot From Code

I am attempting to plot the relation between two variables, but when I run the plot command, I receive a blank graph. Here is my code:

>> Yp=62e9;

>> Yfca=250e9;

>> yfsi=480e9;

>> d31=-320e-12;

>> a=linspace(0,1);

>> d31eff=-d31./((log(1-a)).*(1./a-0.5));

>> vp=1;

>> d31multi=d31eff.*Yp.*vp./((Yp-Yfca)*vp+Yfca)

>> plot(a,d31multi/d31eff)

Answer 1

[Star Strider]

It is necessary to do element-wise division in the plot call second argument:

d31multi./d31eff

However there are other problems, and I must defer to you to solve.

Yp=62e9;
Yfca=250e9;
yfsi=480e9;
d31=-320e-12;
a=linspace(0,1);
d31eff=-d31./((log(1-a)).*(1./a-0.5));
vp=1;
d31multi=d31eff.*Yp.*vp./((Yp-Yfca)*vp+Yfca)

d31multi = 1×100

1.0e-09 * NaN -0.3200 -0.3200 -0.3200 -0.3200 -0.3199 -0.3199 -0.3199 -0.3198 -0.3198 -0.3197 -0.3196 -0.3196 -0.3195 -0.3194 -0.3193 -0.3192 -0.3191 -0.3189 -0.3188 -0.3186 -0.3185 -0.3183 -0.3181 -0.3180 -0.3178 -0.3175 -0.3173 -0.3171 -0.3168

Lv = ~isnan(d31multi);
plot(a,d31multi./d31eff)

.

Answer 2

[David Hill]

Yp=62e9;
Yfca=250e9;
yfsi=480e9;
d31=-320e-12;
a=linspace(0,1);
d31eff=-d31./((log(1-a)).*(1./a-0.5));
vp=1;
d31multi=d31eff.*Yp.*vp./((Yp-Yfca)*vp+Yfca)

d31multi = 1×100

1.0e-09 * NaN -0.3200 -0.3200 -0.3200 -0.3200 -0.3199 -0.3199 -0.3199 -0.3198 -0.3198 -0.3197 -0.3196 -0.3196 -0.3195 -0.3194 -0.3193 -0.3192 -0.3191 -0.3189 -0.3188 -0.3186 -0.3185 -0.3183 -0.3181 -0.3180 -0.3178 -0.3175 -0.3173 -0.3171 -0.3168

plot(a,d31multi./d31eff);%forgot the '.' all ones