How to creating MAT file

This is my parameter

% Parameter Massa
m1 = 8095; % massa train set 1 dalam kg
m2 = 8500; % massa train set 2 dalam kg
m3 = 8457; % massa train set 3 dalam kg

% Parameter Gaya
f1 = 205.*10^3; % Gaya train set 1 dalam N
f2 = 302.*10^3; % Gaya train set 2 dalam N
f3 = 302.*10^3; % Gaya train set 3 dalam N

% Parameter Resistansi
c_0_1 = 0.01176;
c_1_1 = 0.00077616;
c_2_1 = 4.48 ;

c_0_2 = 0.01176 ;
c_1_2 = 0.00077616;
c_2_2 = 4.48;

c_0_3 = 0.01176 ;
c_1_3 = 0.00077616;
c_2_3 = 4.48;

% Desired Speed
v_0 = 300;

% Desired Train Following Headway Time
hstar = 120;

a_1   = -1./m1.*(c_1_1 + 2.*c_2_1.*v_0);  
a_2   = -1./m2.*(c_1_2 + 2.*c_2_2.*v_0); 
a_3   = -1./m3.*(c_1_3 + 2.*c_2_3.*v_0); 

a_1_head = 1-(a_1.*hstar);
a_2_head = 1-(a_2.*hstar);
a_3_head = 1-(a_3.*hstar);

b = 1;

p_1 = -1./m1.*(c_0_1 - c_2_1.*(v_0).^2);
p_2 = -1./m2.*(c_0_2 - c_2_2.*(v_0).^2);
p_3 = -1./m3.*(c_0_3 - c_2_3.*(v_0).^2);

I want to save this parameter into MAT file extension

save valueparameters.mat

But it can't save it said permission denied

Error using save
Unable to write file valueparameters.mat: permission denied.

Error in valueparameters (line 44)
save valueparameters.mat

How I save the file with mat extension?

[Stephen23]

What is your current directory? Please show us the output of this command:

pwd

[Ivan Dwi Putra]

my current directory is G:/Ivan

I save in my directory not in C:/ProgramFiles

this is what you meant?

I save in that directory

pwd

[Stephen23]

"my current directory is G:/Ivan"

No, what you show is that your current directory is actually C:\Program Files\Polyspace...

"I save in my directory not in C:/ProgramFiles"

So far it seems very likely that you are trying to save this file in the installation folder of Polyspace. Bad idea.

Do NOT use this folder as your current directory!

Do NOT save/change any files in this folder!

[Ivan Dwi Putra]

How i save not in installation folder?

when i click run in editir tab

i alaways save my code in G directory not in C, use save

but when i want save mat file why it can't save in G directory?

[Stephen23]

"How i save not in installation folder?"

The simplest approach is to change the current directory to whatever directory you want to save your file in.

Do NOT use the installation folder of any application as the current directory.

Perhaps you ended up there by mistake, it really does not matter, the fact is, you need to change your current directory.

[Ivan Dwi Putra]

ok thank you

Answer 1

[Tejas Turakhia]

This is working on my system:

clear all
clc

% Parameter Massa
m1 = 8095; % massa train set 1 dalam kg
m2 = 8500; % massa train set 2 dalam kg
m3 = 8457; % massa train set 3 dalam kg
% Parameter Gaya
f1 = 205.*10^3; % Gaya train set 1 dalam N
f2 = 302.*10^3; % Gaya train set 2 dalam N
f3 = 302.*10^3; % Gaya train set 3 dalam N
% Parameter Resistansi
c_0_1 = 0.01176;
c_1_1 = 0.00077616;
c_2_1 = 4.48 ;
c_0_2 = 0.01176 ;
c_1_2 = 0.00077616;
c_2_2 = 4.48;
c_0_3 = 0.01176 ;
c_1_3 = 0.00077616;
c_2_3 = 4.48;
% Desired Speed
v_0 = 300;
% Desired Train Following Headway Time
hstar = 120;
a_1   = -1./m1.*(c_1_1 + 2.*c_2_1.*v_0);  
a_2   = -1./m2.*(c_1_2 + 2.*c_2_2.*v_0); 
a_3   = -1./m3.*(c_1_3 + 2.*c_2_3.*v_0); 
a_1_head = 1-(a_1.*hstar);
a_2_head = 1-(a_2.*hstar);
a_3_head = 1-(a_3.*hstar);
b = 1;
p_1 = -1./m1.*(c_0_1 - c_2_1.*(v_0).^2);
p_2 = -1./m2.*(c_0_2 - c_2_2.*(v_0).^2);
p_3 = -1./m3.*(c_0_3 - c_2_3.*(v_0).^2);

cd('your directory address'); % add this line to change the directory where file needs to be saved
save valueparameters.mat

[Ivan Dwi Putra]

ok thank you

[Stephen23]

Rather than using cd in code (which slows code down and makes debugging more difficult) the cd command should be called just once (i.e. from the command line) to change the current directory.

To save files to a different directory using absolute/relative filenames is more efficient.

[Ivan Dwi Putra]

it works thank you