Vector multiplication error no matter what I try

I'm writing a code to help me graph the yield envelope for two ductile failure theories. I have all the equations I need, but I keep getting an error saying:

Error in * (line 317)

X = privBinaryOp(A, B, 'symobj::mtimes');

Error in PlottingDuctileFailureEnvelope (line 44)

yTopDE = ( sqrt(-4*(Mvar.^2)*(varxDE.^2) + 4.*Mvar + (Nvar.^2).*varxDE.^2) -

varxDE.*Nvar)./(2.*Mvar);

I'm confused, since there's no more *s in the equation in question that don't have a . in front of them.

I'm using MATLAB R2019a if that helps, and it's a student version.

Here's my code:

%%%%  PRODUCES GRAPHS FOR THE MSS AND DE STRESS YIELD ENVELOPES
clear;
clc;

%input Sy
Sy = input('What is the yield strength of the material in the given units?  ');
%for all tests, assuming Sy=1

%set (Sy,0) as an intercept point and the unknown b radius
x1 = Sy;
y1 = 0;
syms Brad;

%solving tilted ellipse equation for b radius
eqn1 = ( (1/(4*Sy^2)) + (1/(2*Brad^2)) )*x1^2 +  ((1/(2*Sy^2)) + (1/(Brad^2)))*x1*y1  +  ((1/(4*Sy^2)) + (1/(2*Brad^2)))*y1^2 == 1;
Brad = solve(eqn1,Brad);


%simplifying for less typing later
Mvar = (1/(4*Sy^2)) + (1/(2*Brad.^2));
Nvar = (1/(2*Sy^2)) + (1/(Brad.^2));


%use found b radius to plot the tilted ellipse for DE
%here are the equations to plot for the DE method
varxDE = linspace(-Sy,Sy);
yTopDE = ( sqrt(-4*(Mvar.^2)*(varxDE.^2) + 4.*Mvar + (Nvar.^2).*varxDE.^2) - varxDE.*Nvar)./(2.*Mvar);
yBotDE = -1*yTopDE;


%here is the stuff to plot for the MSS method
%Case 1
c1x = Sy;
c1y = linspace(0,Sy);
%case 3
c3x = linspace(-Sy,0);
c3y = -Sy;
%case 2
c2x = linspace(0,Sy);
c2y = c2x - Sy;

%now, to flip across y=x line
%case 1.1
c11x = linspace(0,Sy);
c11y = Sy;
%case 3.1
c31x = -Sy;
c31y = linspace(-Sy,0);
%case 2.1
c21x = linspace(-Sy,0);
c21y = c21x + Sy;

%hold on, plot functions, hold off
hold on
%equations
plot(c1x,c1y,c2x,c2y,c3x,c3y,c11x,c11y,c21x,c21y,c31x,c31y,'g');
plot(varxDE,yTopDE,varxDE,yBotDE,'r');

%axes and chart title
title('MSS and DE Stress Yield Envelope');
xlabel('sigma x axis (in given units)');
ylabel('sigma y axis (in given units)');
hold off

[Rik]

Please format your question with the tools in the top bar in the editor.

[Kara Landing]

How do I need to format it? This is my first time asking a question on here. Did that do it?

Answer 1

[Walter Roberson]

Repaired code attached. You were missing some ./ and .* operations.

[Kara Landing]

Thank you!!!