"Argument to dynamic structure reference must evaluate to a valid field name" error please code also been attached????? and also i cannot execute it.

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prithvi raj 2019-6-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/468587-argument-to-dynamic-structure-reference-must-evaluate-to-a-valid-field-name-error-please-code-also

评论： Alex Mcaulley 2019-6-24

采纳的回答： Alex Mcaulley

clc;

close all;

%%giving the inputs for calculating the Specular Reflections

thetaInDegrees1 = linspace(44,46,100);

thetaInDegrees2 = 45;

thetaInDegrees3 = 0;

g = 0;

Lcorr = 2.3;

x = 25 * Lcorr;

y = 25 * Lcorr;

f = 300e9;

%% Formula For finding Specular Reflections

Lx = 10*Lcorr;

Ly = 10*Lcorr;

c = physconst('lightspeed');

lambda = c/f;

K = 2*pi/lambda;

Vx = K*(sin(thetaInDegrees1)-sin(thetaInDegrees2)*cos(thetaInDegrees3));

Vy = K*(-sin(thetaInDegrees2)*cos(thetaInDegrees3));

rho= sinc(Vx*Lx) * sinc(Vy*Ly);

rhorho = exp(-g) * ((rho).^2);

%printing in degrees

plot(thetaInDegrees1,rhorho);

hold on

plot(thetaInDegrees1,rhorho);

hold on

plot(thetaInDegrees1,rhorho);

hold on

plot(thetaInDegrees1,rhorho);

hold on

axis equal

xlabel('\theta');

ylabel('<\rho\rho^*>_s_p_e_c_ _o_n_l_y_ [dB]')

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prithvi raj 2019-6-24

编辑：prithvi raj 2019-6-24

this is the result which i am expecting from the graph but i am not getting the results...please help me out...

x=y=[25,50,100,200] * Lcorr

Alex Mcaulley 2019-6-24

What are the equations are you using? How is the relationship between x and rhorho (in your code rhorho doesn't depend on x)?

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Answer 1

Alex Mcaulley 2019-6-24

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/468587-argument-to-dynamic-structure-reference-must-evaluate-to-a-valid-field-name-error-please-code-also#answer_380521

在 MATLAB Online 中打开

You need to change those lines

Vx = K.(sin(thetaInDegrees1)-sin(thetaInDegrees2)*cos(thetaInDegrees3));
Vy = K.(-sin(thetaInDegrees2)*cos(thetaInDegrees3));

by

Vx = K*(sin(thetaInDegrees1)-sin(thetaInDegrees2)*cos(thetaInDegrees3));
Vy = K*(-sin(thetaInDegrees2)*cos(thetaInDegrees3));

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prithvi raj 2019-6-24

Thank You..

prithvi raj 2019-6-24

Error using plot

Data must be a single matrix Y or a list of pairs X,Y.

plot(thetaInDegrees1,x1,rhorho);

can anyone please help me out in this problem.. i cannot run this program... the main thing is like i need to get the x-axis in degrees. like 45,44.5,45.45.5,46.

clc;

close all;

%%giving the inputs for calculating the Specular Reflections

thetaInDegrees1 = linspace(44,46,100);

thetaInDegrees2 = 45;

thetaInDegrees3 = 0;

g = 0;

Lcorr = 2.3;

x1 = 25 * Lcorr;

x2 = 50 * Lcorr;

x3 = 100 * Lcorr;

x4 = 200 * Lcorr;

f = 300e9;

%% Formula For finding Specular Reflections

Lx = 10*Lcorr;

Ly = 10*Lcorr;

c = physconst('lightspeed');

lambda = c/f;

K = 2*pi/lambda;

Vx = K*(sin(thetaInDegrees1)-sin(thetaInDegrees2)*cos(thetaInDegrees3));

Vy = K*(-sin(thetaInDegrees2)*cos(thetaInDegrees3));

rho= sinc(Vx*Lx) * sinc(Vy*Ly);

rhorho = exp(-g) * ((rho).^2);

%printing in degrees

plot(thetaInDegrees1,x1,rhorho);

hold on

plot(thetaInDegrees1,x2,rhorho);

hold on

plot(thetaInDegrees1,x3,rhorho);

hold on

plot(thetaInDegrees1,x4,rhorho);

hold on

axis equal

xlabel('\theta');

ylable('<rho*rho>^*_spec only [dB]')

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"Argument to dynamic structure reference must evaluate to a valid field name" error please code also been attached????? and also i cannot execute it.

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"Argument to dynamic structure reference must evaluate to a valid field name" error please code also been attached????? and also i cannot execute it.

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