Why is my subplot title in bold?

Hi, I encounter a strange plotting behaviour. I use the command:

sgtitle

to insert a title above my subplots. Using this command, some figures appear to plot the title in bold, while others show 'normal' text. I prefer the latter. Please see the figures below. It really looks like a bug to me. It is a minor issue, but i would like to get all titles in plain text instead of bold. How can i fix this?

set(0,'defaulttextinterpreter','latex');
%% Code for Bold plot: (unprefered) 
subplot(1,2,2); hold on 
sgtitle('Steady Aerodynamic Model');
for k=1:1:length(real_p)
plot(v(j),real_p(k),'.k','MarkerSize',6); 
end
xlabel(' v [m/s]'); ylabel( 'real $${\sigma}$$');grid on; hold off

subplot(1,2,1); hold on 
for l=1:1:length(imag_p)
plot(v(j),imag_p(l),'.k','MarkerSize',6);
end
xlabel(' v [m/s]'); ylabel( 'imag $${\omega}$$');grid on; ylim([0 50]);
hold off

%% code for 'normal plan text' plot (prefered:) 
sgtitle({'Steady Aerodynamic Model Theodorsen'})
subplot(1,2,1); hold on 
plot(v,imag(p_final),'.k')
xlabel(' v [m/s]'); ylabel( 'imag $${\omega}$$');grid on; ylim([0 50]);
subplot(1,2,2); hold on 
plot(v,real(p_final),'.k')
xlabel(' v [m/s]'); ylabel( 'real $${\sigma}$$');grid on; 

Bold:

Not bold (prefered):

[Rik]

Can you make a MWE so we can run your code without any other dependencies and can reproduce your issue? The code you posted has several missing variables (including the overwriting of the imaginary unit j with a non-zero real integer).

If you have the bioinformatics toolbox you could also use suptitle.

[Rik]

I can't reproduce your screenshots with R2020a. So apparently something changed in sgtitle in the interim.

[Jurrien Plijter]

Interesting, i will consider updating my Matlab version then. Thank you. (So i quess it is indeed a bug.)

[Rik]

Original question body retrieved from Google cache:

Hi, I encounter a strange plotting behaviour. I use the command:

sgtitle

to insert a title above my subplots. Using this command, some figures appear to plot the title in bold, while others show 'normal' text. I prefer the latter. Please see the figures below. It really looks like a bug to me. It is a minor issue, but i would like to get all titles in plain text instead of bold. How can i fix this?

set(0,'defaulttextinterpreter','latex');
%% Code for Bold plot: (unprefered) 
subplot(1,2,2); hold on 
sgtitle('Steady Aerodynamic Model');
for k=1:1:length(real_p)
plot(v(j),real_p(k),'.k','MarkerSize',6); 
end
xlabel(' v [m/s]'); ylabel( 'real $${\sigma}$$');grid on; hold off

subplot(1,2,1); hold on 
for l=1:1:length(imag_p)
plot(v(j),imag_p(l),'.k','MarkerSize',6);
end
xlabel(' v [m/s]'); ylabel( 'imag $${\omega}$$');grid on; ylim([0 50]);
hold off

%% code for 'normal plan text' plot (prefered:) 
sgtitle({'Steady Aerodynamic Model Theodorsen'})
subplot(1,2,1); hold on 
plot(v,imag(p_final),'.k')
xlabel(' v [m/s]'); ylabel( 'imag $${\omega}$$');grid on; ylim([0 50]);
subplot(1,2,2); hold on 
plot(v,real(p_final),'.k')
xlabel(' v [m/s]'); ylabel( 'real $${\sigma}$$');grid on; 

Bold:

Not bold (prefered):

[Rik]

Deleted comment:

clear all; clc; close all; format long g;
set(0,'defaulttextinterpreter','latex');
figsize_x=350;
figsize_y=650; 

%% input parameters 
%perc=0.7012;            %typical section location for matching bending frequency 
perc=0.6346;             %typical section location for matching torsion frequency 
X=fprintf('Location typical section = %f',perc);disp(X);

L=16*perc;
% Flight parameters 
rho=0.0889;

% Mass parameters
ma        = 0.75;
Icg_theta = 0.1;

% Geometric parameters
span    = 16;
b       = 0.5;
a       = 0;
c       = 1/b;
x_theta = 0; %=0 % - = CG voor EA, Vf inc. + = CG achter EA, Vf dec. 
x_beta  = 0;
S       = 2*b;

% Stiffness parameters 
EI      = 2e4;
GJ      = 1e4;
K_h     = 3*EI/(L^4);%/span;
K_theta = GJ/L^2;%/span;

% Ms parameters 
m       = ma;
S_theta = ma*x_theta*b;
S_beta  = 0;
I_theta = ma*(x_theta*b)^2+Icg_theta;

% create structural matrices
Ms = [m        S_theta  ;
      S_theta  I_theta  ;];

Ks = [K_h       0      ;
        0      K_theta ;];
    
 %% Flutter steady aerodynamic model 
v=0.1:1:60;
figure('position', [100, 100, figsize_y, figsize_x])

for j=1:1:length(v)
v(j);
q=0.5*rho*v(j)^2;

a0=K_h*(K_theta-q*S*2*pi*b*(0.5+a));
a1=0;
a2=m*K_theta+I_theta*K_h-(m*(0.5+a)*b+S_theta)*q*S*2*pi;
a3=0;
a4=m*I_theta-S_theta^2;
det_acoef=a2^2-4*a4*a0;

pol=[a4 a3 a2 a1 a0];
p=roots(pol);

imag_p=imag(p);
real_p=real(p);


subplot(1,2,2); hold on 
for k=1:1:length(real_p)
plot(v(j),real_p(k),'.k','MarkerSize',6);hold on;  
end
xlabel(' v [m/s]'); ylabel( 'real $${\sigma}$$');grid on; hold off

subplot(1,2,1); hold on 
for l=1:1:length(imag_p)
plot(v(j),imag_p(l),'.k','MarkerSize',6);hold on;
end
xlabel(' v [m/s]'); ylabel( 'imag $${\omega}$$');grid on; ylim([0 50]);
hold off

sgtitle('Steady Aerodynamic Model');
t.FontWeight='normal';

end

syms ps
p_final = []; 
figure('position', [100, 100, figsize_y, figsize_x])

for j = 1:1:length(v)
    mat_x=pi.*rho.*v(j)^2.*[0 2*b; 0 -b^2];
    A=ps^2*Ms+Ks+mat_x;
    det_A=det(A);
    poly=double(sym2poly(det_A));
    p_add=roots(poly);
    p_final=[p_final p_add];
end

for z=1
sgtitle({'Steady Aerodynamic Model Theodorsen'})
subplot(1,2,1); hold on 
plot(v,imag(p_final),'.k')
xlabel(' v [m/s]'); ylabel( 'imag $${\omega}$$');grid on; ylim([0 50]);
subplot(1,2,2); hold on 
plot(v,real(p_final),'.k')
xlabel(' v [m/s]'); ylabel( 'real $${\sigma}$$');grid on; 
end 

[madhan ravi]

Thank you Rik!

[Rena Berman]

(Answers Dev) Restored edit

Answer 1

[madhan ravi]

https://www.mathworks.com/help/matlab/ref/matlab.graphics.illustration.subplot.text-properties.html#mw_ca9c0e63-ba43-488d-8c38-bc17efb91467_sep_shared-FontWeight - set it to 'normal'

[Jurrien Plijter]

Doesn't change anything. If i select 'bold' by that setting, the title appears even bolder than it already is.

[madhan ravi]

Yes you’re right didn’t test it.