How to creating MAT file

Question

Ivan Dwi Putra 2020-10-19

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/618613-how-to-creating-mat-file

评论： Ivan Dwi Putra 2020-10-19

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?

6 个评论
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Stephen23 2020-10-19

编辑：Stephen23 2020-10-19

"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 2020-10-19

ok thank you

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Answer 1

Tejas Turakhia 2020-10-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/618613-how-to-creating-mat-file#answer_517878

在 MATLAB Online 中打开

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

3 个评论
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Stephen23 2020-10-19

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 2020-10-19