Why do I have a Syntax Error?

Why is this incorrect? how do I correct this?

BuyMatrix=(k,idx(i)) (k,p(idx(i)));

Error: File: pairstrading.m Line: 204 Column: 34 Expression or statement is incorrect--possibly unbalanced (, {, or [.

all variables are correctly specified as far as i know

just a problem with syntax and brackets

thanks

[Jan]

This is obviously no valid Matlab syntax. As long, as you do not explain, what you wnat to achieve, it is impossible to guess ameaningful suggestion for improvement. So please clarify, what this command should do.

[Tomasz Mlynowski]

What i want to achieve is to have a complete matrix of a for loop to be filled in reading from a [-1 1] vector. i have successfully done this for the first loop however it is not reading correctly the anyPos line

anyPos is to fill the matrix out for k.

for instance i have for i=1:length(idx)

if (k==1)||(anyPos(k-1,idx(i))==0)

if (dist(k,idx(i))>0)

assetsNumber=[idx(i) p(idx(i))];
directionTrade(k,assetsNumber) =[-1 1]; 
and i want create the correct anyPos to take the correct [-1 1] for idx(i) and p(idx(i))

i want to have

anyPosShort(k,idx(i))=-1;
anyPosLong(k,p(idx(i)))=1;

combined into one line

how do I do this?

Answer 1

[Kevin Claytor]

What are you trying to do; access a portion of BuyMatrix, or set BuyMatrix to be a matrix? The former would be accomplished with;

BuyMatrix(k,idx(i)) = ...;

The later would be done with;

BuyMatrix = <actual matrix expression>;

Matlab doesn't really know what to do with an expression of the type;

(1,2)

Just type that in and you'll get the same error. This isn't a vector ([1,2]), and it's not telling us to access row 1, col 2 of a matrix, nor does it correspond to any other command, hence the error.

[Tomasz Mlynowski]

What i want to achieve is to have a complete matrix of a for loop to be filled in reading from a [-1 1] vector. i have successfully done this for the first loop however it is not reading correctly the anyPos line

anyPos is to fill the matrix out for k.

for instance i have for i=1:length(idx)

    if (k==1)||(anyPos(k-1,idx(i))==0)

    if (dist(k,idx(i))>0)

    assetsNumber=[idx(i) p(idx(i))];
    directionTrade(k,assetsNumber) =[-1 1]; 
and i want create the correct anyPos to take the correct [-1 1] for idx(i) and p(idx(i))

i want to have

anyPosShort(k,idx(i))=-1;
anyPosLong(k,p(idx(i)))=1;

combined into one line

how do I do this?

Answer 2

[Walter Roberson]

Maybe you want

BuyMatrix = [k, idx(i); k, p(idx(i))];