Uploaded May 2020 | Updated September 2026, 49 minutes ago
In this video I show you how to measure and calculate density of a solid object with an irregular shape. Here I use Archimedes' principle to calculate the volume of the object. Density can sometimes be used to identify or at least narrow the options for the material of an object.
In this video I show you how to measure and calculate density of a solid object with an irregular shape. Here I use Archimedes' principle to calculate the volume of the object. Density can sometimes be used to identify or at least narrow the options for the material of an object.
![How to code a stopwatch in MATLAB App designer
In this video a show you how to code as simple stopwatch in MATLAB App designer. Just shared the thought process i went through to make this. i have coded it a while back and today i just had to think a bit to remember what i did before.
The work load becomes so huge these days that basically nothing moves forward. So to laugh at the life pressure I decided to make a new video. Dear life, if you are going to challenge me with a lot of pressure, I am going to accept the challenge and add some more on to of what you have for me.
Finance:
N=8, subs=190
Available budget (N):
190-100-8*(8+1)=18
Storage limit:
2^ln(190)=37.97
The code:
You must place its part under right functions/properties
%%%%%%%%%%%%%%%%%
properties (Access = private)
a=1; % Description
end
%%%%%%%%%%%%%%%%%
function startupFcn(app)
app.EditField.Value=00:00:00
app.EditField.FontSize=40;
end
%%%%%%%%%%%%%%%%%
function STARTButtonPushed(app, event)
S_ini=0;
if strcmp(app.STARTButton.Text,CONTINUE)
st=app.EditField.Value;
h=0;m=0;s=0;
for i=1:size(st,2)
if strcmpi(st(i),:)
break
end
h=[h st(i)];
end
for i=i+1:size(st,2)
if strcmpi(st(i),:)
break
end
m=[m st(i)];
end
for i=i+1:size(st,2)
if strcmpi(st(i),:)
break
end
s=[s st(i)];
end
S_ini=str2num(h)*3600+str2num(m)*60+str2num(s);
app.STARTButton.Text=START;
app.STOPButton.Text=STOP;
end
c=clock;
m=0;
S_tot=0;
app.a=0;
while app.a 0
c1=clock;
if c1(5)~=c(5)
S_tot=c1(6)-c(6)+60;
m=m+1;
c(5)=c1(5);
else
S_tot=c1(6)-c(6)+60*m;
end
S_tot=S_tot+S_ini;
A(1)=floor(S_tot/3600);
A(2)=floor((S_tot-A(1)*3600)/60);
A(3)=S_tot-A(1)*3600-A(2)*60;
app.EditField.Value=sprintf(%02.0f:%02.0f:%02.2f,A(1),A(2),A(3));
% app.EditField.Value=[num2str(A(1)) : num2str(A(2)) : num2str(A(3))];
% app.EditField.Value=num2str(S_tot);
pause(0.01);
end
end
%%%%%%%%%%%%%%%%%
function STOPButtonPushed(app, event)
if strcmpi(app.STOPButton.Text,RESTART)
app.EditField.Value=00:00:00;
app.STARTButton.Text=START;
app.STOPButton.Text=STOP;
return
end
if app.a 0
app.a=1;
app.STARTButton.Text=CONTINUE;
app.STOPButton.Text=RESTART;
end
end How to code a stopwatch in MATLAB App designer](https://i.ytimg.com/vi/VwJsteRqBWE/mqdefault.jpg)









