Vector of structures for parameter sensitivity analysis

Hello everybody,

I implemented the equations of a simple model. These equations use the variables stored in structures. I would like to use a vector of structures where each element of the vector contains the variables (organized in structures) of a design under consideration.

For instance, for a design I have as variables:

DSN.group1.a = 5/1000;
DSN.group1.b = 10/1000;

and the equation I am evaluating are:

DSN.group2.res1 = DSN.group1.a + DSN.group1.b;
DSN.group2.res2 = DSN.group1.a * DSN.group1.b;

So far so good. Now, I would like to make a parameter sensitivity analysis with respect to parameter DSN.a using the variable parA, so I do:

NcasesA = 3;
parA = linspace(50,200,NcasesA)/1000;

countExt =1;

for count=1:NcasesA
   DSNspace.DSN(countExt) = fun_evalDSN(parA(countExt)) ;
   countExt=countExt+1;
end

where:

function DSN = fun_evalDSN(parA)
    DSN.group1.a = parA;
    DSN.group1.b = 10/1000;
    DSN.group2.res1 = DSN.group1.a + DSN.group1.b;
    DSN.group2.res2 = DSN.group1.a * DSN.group1.b;
end

Which is working correctly.

Consider the case where I have more variables to vary (not only DSN.a but also DSN.b and other), I would like in the end to plot a scatter plot of DSN.res1 vs DSN.res2.

The problem is that none of the following commands work:

scatter(DSNspace.DSN.group2.res1,DSNspace.DSN.group2.res2)

or

scatter([DSNspace.DSN.group2.res1],[DSNspace.DSN.group2.res2])

Error message:

"Expected one output from a curly brace or dot indexing expression, but there were 3 results."

Could you please help me? Do you have any recommendation or suggestion about how to handle my variables?

Thanks in advance

Andrea