Index exceeds the number of array elements. Index must not exceed 1 error

I have a guide gui thingy that I am trying to build to calculate triangle dimensions base on user input of angles and sides.

I have in that folder a functon to do the calculation:

function [TS1,TS2,TS3,TA1,TA2,TA3,H1,H2,H3,area] = triangleDimsSAS(TS1,TS2,TA3)

%calculates various triangle dimesions base on 2 sides and an angle

TS3=sqrt(TS2.^2 + TS1.^2 - 2 * TS2 * TS1 * cosd(TA3));

TA2 = acosd((TS3.^2 + TS1.^2 - TS2.^2)/(2 * TS3 * TS1));

TA1 = acosd((TS3.^2 + TS2.^2 - TS1.^2)/(2 * TS3 * TS2));

area = (TS1 * TS2 *sind(TA3))/2;

H1 = 2 * area/TS1;

H2 = 2 * area/TS2;

H3 = 2 * area/TS3;

%x = [0,TS3,sqrt(TS2.^2-H3.^2),0];

%y = [0,0,H3,0];

end

And in the guide code I have the following on a pushbutton object, where I call that function:

function calcBtn_Callback(hObject, eventdata, handles)

% hObject handle to calcBtn (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

sideA = str2double(get(handles.sideA,'String'));

sideB = str2double(get(handles.sideB,'String'));

sideC = str2double(get(handles.sideC,'String'));

angleA = str2double(get(handles.angleA,'String'));

angleB = str2double(get(handles.angleB,'String'));

angleC = str2double(get(handles.angleC,'String'));

if (sideA>0 && sideB>0 && angleC>0) || (sideB>0 && sideC>0 && angleA>0) || (sideB>0 && sideA>0 && angleB>0)

if (sideA>0 && sideB>0 && angleC>0)

triDimvec = triangleDimsSAS(sideA,sideB,angleC);

x = [0,triDimvec(3),(sqrt((triDimvec(2).^2)-(triDimvec(9).^2))),0];

y = [0,0,triDimvec(9),0];

infoTxt1 = sprintf('Side A: %0.2f; \n Side B: %0.2f; \n Side C: %0.2f; \n ', triDimvec(1), triDimvec(2), triDimvec(3));

infoTxt2 = sprintf('Angle A: %0.2f; \n Angle B %0.2f; \n Angle A: %0.2f; \n',triDimvec(4), triDimvec(5), triDimvec(6));

infoTxt3 = sprintf('Height A: %0.2f; \n Height B: %0.2f; \n Height C: %0.2f;\n Area: %0.2f;\n',triDimvec(7), triDimvec(8), triDimvec(9), triDimvec(10));

infoTxt4 = sprintf('Vertex Coordinates:\n ');

infoTxt5 = sprintf('A[%0.2f,%0.2f]; B[%0.2f,%0.2f]; C[%0.2f,%0.2f];',x(1),y(1),x(2),y(2),x(3),y(3));

set(handles.calcInfo, 'String',{infoTxt1,infoTxt2,infoTxt3,infoTxt4,infoTxt5});

plot(x,y);

axis padded;axis equal

else

%do something 1

end

else

%do something 2

end

Try to run it ends with the following errors:

Index exceeds the number of array elements. Index must not exceed 1.

Error in ATCV1>calcBtn_Callback (line 250)

x = [0,triDimvec(3),(sqrt((triDimvec(2).^2)-(triDimvec(9).^2))),0];

Error in gui_mainfcn (line 95)

feval(varargin{:});

Error in ATCV1 (line 42)

gui_mainfcn(gui_State, varargin{:});

Error in matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)ATCV1('calcBtn_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating UIControl Callback.

If I run it all from whithin the gui code, with in the if statement, I dont get any errors. So....what does it want? why I cannot call an element of my vector (from the return of the triangleDimsSAS function to than be used as another vector (x,y) elements or elemnts after some arithmetic manipulations?

Answer 1

[VBBV]

This function is not returning all Ten variables as defined by fucntion output [TS1,TS2,TS3,TA1,TA2,TA3,H1,H2,H3,area]

function [TS1,TS2,TS3,TA1,TA2,TA3,H1,H2,H3,area] = triangleDimsSAS(TS1,TS2,TA3)
%calculates various triangle dimesions base on 2 sides and an angle
TS3=sqrt(TS2.^2 + TS1.^2 - 2 * TS2 * TS1 * cosd(TA3));
TA2 = acosd((TS3.^2 + TS1.^2 - TS2.^2)/(2 * TS3 * TS1));
TA1 = acosd((TS3.^2 + TS2.^2 - TS1.^2)/(2 * TS3 * TS2));
area = (TS1 * TS2 *sind(TA3))/2;
H1 = 2 * area/TS1;
H2 = 2 * area/TS2;
H3 = 2 * area/TS3;
%x = [0,TS3,sqrt(TS2.^2-H3.^2),0];
%y = [0,0,H3,0];
end

its only returning TS3 TA2 TA1 area H1 H2 H3 only 7 varables. but in this line below

 x = [0,triDimvec(3),(sqrt((triDimvec(2).^2)-(triDimvec(9).^2))),0];
                                                      ^^

you are accessing 9th element of triDimvec which does not exist

[Barak]

@VBBV can I assign the missing variables of the output directly from the input of the function?

like so:

TS1 = TS1;

TS2 = TS2;

TS3=sqrt(TS2.^2 + TS1.^2 - 2 * TS2 * TS1 * cosd(TA3));

TA1 = acosd((TS3.^2 + TS2.^2 - TS1.^2)/(2 * TS3 * TS2));

TA2 = acosd((TS3.^2 + TS1.^2 - TS2.^2)/(2 * TS3 * TS1));

TA3 = TA3;

area = (TS1 * TS2 *sind(TA3))/2;

H1 = 2 * area/TS1;

H2 = 2 * area/TS2;

H3 = 2 * area/TS3;

So no they are all account for.

[VBBV]

yes, you can do so such that triDimvec has all elements which you want to access in the pushbutton callback

[Barak]

thank you.