writing some parameters from mfile on txt file and problem with some parameters

Hi all

I am trying to write some parameters from one matlab file , by defining a function that does this writing on a txt file

on the main file I have some parameters like :

    p1 = 12.5;
    q=2*p1;
    tb=7.49;
    tf=1.2;
    tw=1.63;
    teta=85;
    d0=70;
    dep=1;
    Et= 109.36e9;
    nut=0.3;
    Eb= 290.482e9;
    nub=0.063;

then I call the function as :

    MakeVar(tf,Et,nut,Eb,nub)

then , in the function m-file I define it like this :

    function MakeVar(tf,Et,nut,Eb,nub)
        fprintf(fid,'p1 = %0.12f\n',p1);
        fprintf(fid,'q = %0.12f\n',q);
        fprintf(fid,'tf = %0.12f\n',tf);
        fprintf(fid,'tb = %0.12f\n',tb);
        fprintf(fid,'tw = %d\n',tw);
        fprintf(fid,'teta = %d\n',teta);
        fprintf(fid,'d0 = %0.12f\n',d0);
        ...

The rest doesn't matter , just the same for all the parameters

I would like to ask you to try it , on your matlab

my question is , before , I was not putting any parameters in the parenthesis of makevar()but Matlab was giving me error

the strange thing was that it was not sensitive on p1 , but when it wanted to write tf , giving me error that tf is not defined , so I had to include it in the function parenthesis , I don't know it's output in this figure or input ?? cause the main shape of the function is :

    function [y1,..,ym] = func(x1,..,xn)

and mine doesnt look like this one , So I need to do it without these strangely setting some of the parameters and not setting some , because I might need to change the names or number of them , so I don't want to check it every time

thank you so much

Answer 1

[per isakson]

"before"

    >> MakeVar()
    Undefined function or variable 'fid'.
    Error in MakeVar (line 3)
        fprintf(fid,'p1 = %0.12f\n',p1);

"then I call the function as"

    >> MakeVar(tf,Et,nut,Eb,nub)
    Undefined function or variable 'fid'.
    Error in MakeVar (line 3)
        fprintf(fid,'p1 = %0.12f\n',p1);

in both cases MATLAB throws an error for the first undefined variable, which it encounters, i.e. fid. It never checks whether p1 exists. That's not "strange"&nbsp! &nbsp (You don't tell what error message your system shows.)

&nbsp

I don't exactly understand what you mean by the last part of your question. However, one cannot argue with MATLAB. One has to play according to its rules, which are defined in the documentation.

&nbsp

In response to comment:

I have made a new experiment with the code, which you show in your question.

• copied your code to two m-files. (See below)
• run the script, MakeVarCall
• got the error: Undefined function or variable 'fid'. (See below.) The reason to the error is that no file is being opened (and there is no variable named&nbsp fid &nbsp).

My result differs from yours and my conclusion is that you run a code, which is different compared to the code you show in your question.

I think that the reason to your problem is a lack of understanding of the scope of variables. The variables p1 and q are not passed to the workspace of the function, MakeVar. See Base and Function Workspaces.

Run MakeVarCall

    >> MakeVarCall
    Undefined function or variable 'fid'.
    Error in MakeVar (line 2)
        fprintf(fid,'p1 = %0.12f\n',p1);
    Error in MakeVarCall (line 14)
    MakeVar(tf,Et,nut,Eb,nub) 
    >>

where &nbsp MakeVarCall.m &nbsp contains the following code

    p1 = 12.5;
    q=2*p1;
    tb=7.49;
    tf=1.2;
    tw=1.63;
    teta=85;
    d0=70;
    dep=1;
    Et= 109.36e9;
    nut=0.3;
    Eb= 290.482e9;
    nub=0.063;
    MakeVar(tf,Et,nut,Eb,nub)

where &nbsp MakeVar.m &nbsp contains the following code

    function MakeVar(tf,Et,nut,Eb,nub)
        fprintf(fid,'p1 = %0.12f\n',p1);
        fprintf(fid,'q = %0.12f\n',q);
        fprintf(fid,'tf = %0.12f\n',tf);
        fprintf(fid,'tb = %0.12f\n',tb);
        fprintf(fid,'tw = %d\n',tw);
        fprintf(fid,'teta = %d\n',teta);
        fprintf(fid,'d0 = %0.12f\n',d0);
    end

[farzad]

ok Thank very much , but the thing is , why for p1 , MATLAB throws error for you , but not for me ? could it be due to some internal parameter overlap ? I first do the clear all , but don't know if it's enough

[per isakson]

I use R2013a.

"was giving me error" &nbsp and &nbsp "but not for me" &nbsp I fail to understand what you try to say.

[farzad]

I am sorry I didn't get notification , I mean , why the first undefined parameter for you is p1 , but for me is tf , while in the first m file , as you noticed , p1 is anticipated to tf

[per isakson]

"why the first undefined parameter for you is p1" &nbsp No it's not. It's &nbsp fid. &nbsp I assume that you run a code, which is different compared to the code you show in your question.

See addition to my answer.

[farzad]

Thanks a lot Per , I will check it , I don't have so much internet , I will check precisely and will put again my code ,but I think that's all , and the question is that why the other variables do not have that problem , while their condition is the same