i was trying to run three different mat files some reason only the first one is read by matlab

load 'testprop1.mat'

eff1= eff;

J1 = J;

t1 = t;

q1 = q;

load 'testprop2.mat'

eff2= eff;

J2 = J;

t2 = t;

q2 = q;

load 'testprop3.mat'

eff3= eff;

J3 = J;

t3 = t;

q3 = q;

plot(J1,t1,J2,t2,J3,t3);

[AndresVar]

your code works OK, the problem might be with your matfiles 2 & 3.

[sujan raj kolachhapati]

i have triedmany times deleting mat files and resaving it . it actually plots files from testprop3 but not the 1 AND 2 any help will be appreciated

Answer 1

[Jan]

It is a frequent cause of unexpected behavior, that MAT files contain other variables that the user assumes. Therefore it is recommended to catch the output of load in a variables. This supports the debugging:

data1 = load('testprop1.mat');
eff1= data1.eff;
J1 = data1.J;
t1 = data1.t;
q1 = data1.q;  
  
data2 = load('testprop2.mat');
eff2= data2.eff;
J2 = data2.J;
t2 = data2.t;
q2 = data2.q;

data3 = load('testprop3.mat');
eff3= data3.eff;
J3 = data3.J;
t3 = data3.t;
q3 = data3.q;

plot(J1,t1,J2,t2,J3,t3);

What do you observe now?

Beside the easier dbugging, this let Matlab run faster also, because calling load to import the data directly into the workspace impedes the JIT acceleration.

[sujan raj kolachhapati]

>> Plot_testprop

Reference to non-existent field 'eff'.

Error in Plot_testprop (line 3)

eff1= data1.eff;

[sujan raj kolachhapati]

it looks like matlab is plotting the data available from workspace, if i clear workspace it wont recognise any variable

[Jan]

Of course clearing the workspace removes the variables. This is the purpose.

Reference to non-existent field 'eff'.

This means, that the MAT file does not contain this variable.