Error using matlab.int​ernal.grap​h.MLGraph.​edgesConst​rWithIndex Source must be a numeric array of positive integer node indices.

Hi,

I am trying to make a simple plot but none of my attempts seems to work. On a main file i use this code

y2=0;
x=-10:0.001:4;
y1=((x+1).^3).*(x-2);
graph(x,y1,y2);

and on file graph.m i use this code

function graph(x,y1,y2)
figure
plot(x,y1,'r-',x,y2,'b-*','MarkerSize',2)
xlabel ( 'x','FontName','Arial','FontSize',10); 
ylabel ( 'y','FontName','Arial','FontSize',10);
title( 'Plot y1, y2','FontSize',10 );

When i change the x as following: x=1:0.001:4; another error occurs "Target must be a numeric array of positive integer node indices."

I also get these errors

Error in matlab.internal.graph.constructFromEdgeList (line 220)

[G, ind] = matlab.internal.graph.MLGraph.edgesConstrWithIndex(s, t, totalNodes);

Error in graph (line 300)

matlab.internal.graph.constructFromEdgeList(...

Error in bisection3 (line 30)

graph(x,y1,y2);

If this has to do with x,y1,y2 being consisted by only positive integers, that does not make sense to me, since plots should also be consisted of negative coordinances if necessary. I am new in matlab so excuse me if this a simple question. I tried to apply other solutions but they din not work

Thank you in advance

Answer 1

[Steven Lord]

The identifier graph already has a meaning in MATLAB. If possible I recommend naming your function and your function file something else.

[Leon17]

I had no clue. It was instructed to use this name for the function. Thanks a lot!