How to save variables in workspace to be used after running the code multiple times?

A = input('Pick an angle 15, 30, 45, or 60      angle = ');
if A ~= [15 30 45 60]
    error('Error. angle must be  15, 30, 45, or 60 degrees     ');
end

b = 4;
c = 4;
a = sidea(b,c,A);
B = asind((b*sind(A))/a);
C = 180 - B - A;
H = C;
E = 180 - C - H;
e = 4;
f = a;
g = 4;
h = 4;
F = asind((f*sind(E))/e);
D = 180 - E - F;
d = sided(e, f, D);
i = d;
G = asind((g*sind(H))/h);
I = 180 - G - H;



%% Variables/Calculations
% Method of Joints
P = 1;
% Joint I
Fig = P / sind(I);
Fei = Fig * cosd(I);

% Joint G
Fge = (Fig*sind(I))/(sind(F));
Fgb = (Fge*cosd(F)+Fig*cosd(I));

% Joint B
Fba = (Fgb)/(cosd(A)+(sind(A)*cotd(C)));
Fbe = (Fba*sind(A))/sind(C);

% Joint E
Fea = Fei - (Fge*cosd(F))+(Fbe*cosd(D));

%% Solving for P

if A == 15
    Fea = -Fea;
    if Fba > Fge
        T = ((8*(trig(A, C, F, I))));
    elseif Fba < Fge
        T = 6 * sind(F);
    end
end

if A == 30 
    Fea = -Fea;
    if Fba > Fge
        Z = ((8*(trig(A, C, F, I))));
    elseif Fba < Fge
        Z = 6 * sind(F);
    end
end

if A == 45 
    Fea = -Fea;
    if Fba > Fbe
        P = (8*(trig(A, C, F, I)));
    elseif Fbe > Fba
        P = ((6*(trig(A, C, F, I)*(sind(C)/sind(A)))));
    end
end

if A == 60 
    R = ((6*(trig(A, C, F, I))));
end

%% User Defined Functions

function [a] = sidea(b, c, A)
[a] = sqrt(b^2 + c^2 - (2*b*c*cosd(A)));
end

function [d] = sided(e, f, D)
[d] = sqrt(e^2 + f^2 - (2*e*f*cosd(D)));
end

function [comp] = trig(A, C, F, I)
[comp] = (cosd(A)+sind(A)*cotd(C))/(cotd(F)+cotd(I));
end

I am trying to run this code four times for four different angles, [15, 30, 45, 60]. I want it to save variables across each run so at the end, i can use them to plot. My problem is, no matter what i do, the variables seem to be overided. I tried to saved the variable as it's own file using save command but I could not run the code because i was trying to load variables that were not yet saved. I tried to initialize these variables and save them as 0 so that i could run the code but then the variables would be overun. If anyone has any idea it would be a great help.

Answer 1

[Walter Roberson]

T = nan;
Z = nan;
P = nan;
R = nan;

for trynum = 1 : 4

    A = input('Pick an angle 15, 30, 45, or 60      angle = ');
    if A ~= [15 30 45 60]
        error('Error. angle must be  15, 30, 45, or 60 degrees     ');
    end
    
    b = 4;
    c = 4;
    a = sidea(b,c,A);
    B = asind((b*sind(A))/a);
    C = 180 - B - A;
    H = C;
    E = 180 - C - H;
    e = 4;
    f = a;
    g = 4;
    h = 4;
    F = asind((f*sind(E))/e);
    D = 180 - E - F;
    d = sided(e, f, D);
    i = d;
    G = asind((g*sind(H))/h);
    I = 180 - G - H;
    
    
    
    %% Variables/Calculations
    % Method of Joints
    P = 1;
    % Joint I
    Fig = P / sind(I);
    Fei = Fig * cosd(I);
    
    % Joint G
    Fge = (Fig*sind(I))/(sind(F));
    Fgb = (Fge*cosd(F)+Fig*cosd(I));
    
    % Joint B
    Fba = (Fgb)/(cosd(A)+(sind(A)*cotd(C)));
    Fbe = (Fba*sind(A))/sind(C);
    
    % Joint E
    Fea = Fei - (Fge*cosd(F))+(Fbe*cosd(D));
    
    %% Solving for P
    
    if A == 15
        Fea = -Fea;
        if Fba > Fge
            T = ((8*(trig(A, C, F, I))));
        elseif Fba < Fge
            T = 6 * sind(F);
        end
    end
    
    if A == 30 
        Fea = -Fea;
        if Fba > Fge
            Z = ((8*(trig(A, C, F, I))));
        elseif Fba < Fge
            Z = 6 * sind(F);
        end
    end
    
    if A == 45 
        Fea = -Fea;
        if Fba > Fbe
            P = (8*(trig(A, C, F, I)));
        elseif Fbe > Fba
            P = ((6*(trig(A, C, F, I)*(sind(C)/sind(A)))));
        end
    end
    
    if A == 60 
        R = ((6*(trig(A, C, F, I))));
    end
end

if isnan(T)
    error('You never selected 15')
end
if isnan(Z)
    error('You never selected 30')
end
if isnan(P)
    error('You never selected 45')
end
if isnan(R)
    error('You never selected 60')
end

plot([15 30 45 60], [T, Z, P, R])

%% User Defined Functions

function [a] = sidea(b, c, A)
[a] = sqrt(b^2 + c^2 - (2*b*c*cosd(A)));
end

function [d] = sided(e, f, D)
[d] = sqrt(e^2 + f^2 - (2*e*f*cosd(D)));
end

function [comp] = trig(A, C, F, I)
[comp] = (cosd(A)+sind(A)*cotd(C))/(cotd(F)+cotd(I));
end

[Stevie Rauch]

I am now getting the error, "Error: File: FinalProject.m Line: 14 Column: 5

Illegal use of reserved keyword "try". I've tried to make sure everythings cleaned up and nothing is missing an End but the problem persists. Thanks for the help thus far!!

[Walter Roberson]

Sorry, change the try to trynum or something like that.

[Stevie Rauch]

%% Clean Up Section
clc;                            % clears command window
close all;                      % closes any previously opened figures
clear;                          % clears variables in workspace


%% Input and Variables

T = nan;
Q = nan;
Z = nan;
R = nan; 

kk = 1
for trynum = 1 : 4
        
        A(kk) = input('Pick an angle 15, 30, 45, or 60      angle = ');
        if A(kk) ~= ([15 30 45 60])
            error('angle must be  15, 30, 45, or 60 degrees     ');
        end
        
        b = 4;
        c = 4;
        a = sidea(b,c,A);
        B = asind((b.*sind(A))/a);
        C = 180 - B - A;
        H = C;
        E = 180 - C - H;
        e = 4;
        f = a;
        g = 4;
        h = 4;
        F = asind((f.*sind(E))./e);
        D = 180 - E - F;
        d = sided(e, f, D);
        i = d;
        G = asind((g.*sind(H))./h);
        I = 180 - G - H;
        
        
        
        %% Variables/Calculations
        % Method of Joints
        P = 1;
        % Joint I
        Fig = P ./ sind(I);
        Fei = Fig .* cosd(I);
        
        % Joint G
        Fge = (Fig.*sind(I))./(sind(F));
        Fgb = (Fge.*cosd(F)+Fig.*cosd(I));
        
        % Joint B
        Fba = (Fgb)./(cosd(A)+(sind(A).*cotd(C)));
        Fbe = (Fba.*sind(A))./sind(C);
        
        % Joint E
        Fea = Fei - (Fge.*cosd(F))+(Fbe.*cosd(D));
        
        %% Solving for P
        
        if A == 15
            Fea = -Fea;
            if Fba > Fge
                T = ((8*(trig(A, C, F, I))));
            elseif Fba < Fge
                T = 6 * sind(F);
            end
        end
        
        if A == 30
            Fea = -Fea;
            if Fba > Fge
                Z = ((8*(trig(A, C, F, I))));
            elseif Fba < Fge
                Z = 6 * sind(F);
            end
        end
        
        if A == 45
            Fea = -Fea;
            if Fba > Fbe
                Q = (8*(trig(A, C, F, I)));
            elseif Fbe > Fba
                Q = ((6*(trig(A, C, F, I).*(sind(C)/sind(A)))));
            end
        end
        
        if A == 60
            R = ((6*(trig(A, C, F, I))));
        end
        kk = kk + 1;
end
 

    if isnan(T)
        error('You never selected 15')
    end
    if isnan(Z)
        error('You never selected 30')
    end
    if isnan(P)
        error('You never selected 45')
    end
    if isnan(R)
        error('You never selected 60')
    end
    
    plot([15 30 45 60], [T, Z, P, R])
    
    
    %% User Defined Functions
    
function [a] = sidea(b, c, A)
[a] = sqrt(b^2 + c^2 - (2*b*c*cosd(A)));
end
    
function [d] = sided(e, f, D)
[d] = sqrt(e.^2 + f.^2 - (2*e.*f.*cosd(D)));
end
    
function [comp] = trig(A, C, F, I)
[comp] = (cosd(A)+sind(A)*cotd(C))/(cotd(F)+cotd(I));
end
    
    

So trynum did work, but I am now trying to create array with all the data that changes so the user can see how variables change when dependent on other variables. When trying to run this code before creating arrays it ran perfectly and saved all the variables across runs, the only problem was that you were only able to see the results for the last user input, not what was input in between. So now I dont get why that could be, all im trying to do is make sure the intermediate data can be seen?

[Walter Roberson]

exactly which variables need to be recorded and at which points? For example do you need to record Fea before and after Fea = -Fea?

[Stevie Rauch]

I think im okay now. I built a structure within the for loop to display the most important values. Thank you for the help though.