Hi. I didn't find anything about this beside (a terribly formatted post) and nothing in the Scripting Index. What is an "invalid matrix token" error? What does it mean? When I try to instantiate a matrix in my script like m = [i j]; where and are numerical variables, it throws the error and points at i. I think that's all the context I can give. Let me know if any clarification specifically is in order, I can try to help you help me. Cheers, Mike

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Invalid Matrix Token

mostarr

Hi. I didn't find anything about this beside <https://community.jmp.com/t5/Discussions/invalid-matrix-token/td-p/2111> (a terribly formatted post) and nothing in the Scripting Index. What is an "invalid matrix token" error? What does it mean?

When I try to instantiate a matrix in my script like

m = [i j];

where <i> and <j> are numerical variables, it throws the error and points at i.

I think that's all the context I can give. Let me know if any clarification specifically is in order, I can try to help you help me.

Cheers,

Mike

Accepted answers

jthi

Cannot exactly explain the error message. Most likely related to this Construct Matrices and in the end:

Construct Matrices from Expressions

To construct matrices from expressions, use Matrix(). Elements must be expressions that resolve to numbers.

Names Default To Here(1);
i = 1;
k = 1;
m = Matrix({{i, k}}); //[1 1]

jthi

Play around with this example:

Names Default To Here(1);
i = 1;
k = 1;
m1 = Matrix({{i, k}}); //(1x2)
m2 = Matrix({{i}, {k}}); //(2x1)
Show(m1, m2);

and check the Construct Matrices From Lists from the link I provided earlier.

gzmorgan0

Hi there,

@jthi provided an answer with hard to find syntax. I am adding on a bit as an FYI. Being a senior citizen, I still like the concept of allocating space for matrix stoage and releasing unused. It saves the need to concatenate, and might be a time savings especially for potentially large matrices.

Also, I think a simple method to create matrices is to use JMP's J function, it is listed in the Scripting Index > Functions > Matrix.

Below is a simple script demonstrating its use. FYI.

Names Default To Here( 1 );

m1x2 = J( 1, 2, 0 );         // a 1x2 matrix of zeros 
m2x1 = J( 2, 1, Empty() );   // a 2x1 matrix all empty values

Show( m1x2, m2x1 );

imax = 100;
jmax = 1000;

//like an ALLOCATE or DIM
mm = J( imax, jmax, Empty() );

//within the program logic and counting say imax = 5 and jmax =3;
imax = 5;
jmax = 3;

//like a redimension 
mm = mm[1 :: imax, 1 :: jmax];

Show( mm, N Col( mm ), N Row( mm ) );

All comments

jthi

Cannot exactly explain the error message. Most likely related to this Construct Matrices and in the end:

Construct Matrices from Expressions

To construct matrices from expressions, use Matrix(). Elements must be expressions that resolve to numbers.

Names Default To Here(1);
i = 1;
k = 1;
m = Matrix({{i, k}}); //[1 1]

mostarr

Thanks, @jthi. That works!

Can you comment briefly on dimensionality? I think I figured it out, {{}{}} is a 2x0, but I don't know how to make a 0x2.

Mike

jthi

Play around with this example:

Names Default To Here(1);
i = 1;
k = 1;
m1 = Matrix({{i, k}}); //(1x2)
m2 = Matrix({{i}, {k}}); //(2x1)
Show(m1, m2);

and check the Construct Matrices From Lists from the link I provided earlier.

mostarr

I am having trouble concatenating using Concat() or |/ my starting array and additional elements. When I Write() the output, it is equivalent to the starting array, nothing was concatenated (result is [0 0]).

mostarr

Okay will do, sorry about the unneccesary post down there, didn't see your response here. Thank you greatly!

jthi

For Matrix Concatenation JMP Help will most likely have the answers JMP Help - Matrix Concatenation

Also remember to set the value to old matrix if you want to change the value

Names Default To Here(1);
i = 1;
k = 1;
m1 = Matrix({{i, k}}); //(1x2)
Write(m1);
Write("\!N");
m1 |/= [2 2]; //or m1 = m1 |/ [2 2]; or m1 = VConcat(m1, [2 2]);
Write(m1);

gzmorgan0

Hi there,

Also, I think a simple method to create matrices is to use JMP's J function, it is listed in the Scripting Index > Functions > Matrix.

Below is a simple script demonstrating its use. FYI.

Names Default To Here( 1 );

m1x2 = J( 1, 2, 0 );         // a 1x2 matrix of zeros 
m2x1 = J( 2, 1, Empty() );   // a 2x1 matrix all empty values

Show( m1x2, m2x1 );

imax = 100;
jmax = 1000;

//like an ALLOCATE or DIM
mm = J( imax, jmax, Empty() );

//within the program logic and counting say imax = 5 and jmax =3;
imax = 5;
jmax = 3;

//like a redimension 
mm = mm[1 :: imax, 1 :: jmax];

Show( mm, N Col( mm ), N Row( mm ) );