Simple blockchain V2V Communication

We are trying to setup basic blockchain in MATLAB.

This code sets up the basic structure for a blockchain in MATLAB. It defines a `Block` class to represent individual blocks, implements a hashing function, and provides functions to create blocks and simulate V2V communication. The code demonstrates the creation of a blockchain and the exchange of messages between two vehicles. The output displays the details of each V2V communication, including the sender, receiver, data, and the newly created block's index and hash.

But when we run this code:

classdef sample
    properties
        Index
        Timestamp
        PreviousHash
        Data
        CurrentHash
    end
    methods
        function block = sample(index, timestamp, previousHash, data)
            block.Index = index;
            block.Timestamp = timestamp;
            block.PreviousHash = previousHash;
            block.Data = data;
            block.CurrentHash = '';
        end
        
        function hash = calculateHash(~, data)
            % Implement your chosen cryptographic hash function here
            % For simplicity, let's assume a simple hash calculation using the ASCII values of the characters
            hash = num2str(sum(double(data)));
        end
        
        function block = createBlock(obj, index, previousHash, data)
            timestamp = datestr(now);
            block = sample(index, timestamp, previousHash, data);
            block.CurrentHash = obj.calculateHash(sprintf('%d%s%s%s', block.Index, block.Timestamp, block.PreviousHash, block.Data));
        end
        
        function blockchain = createBlockchain(obj)
            blockchain = {};
            genesisBlock = obj.createBlock(1, '0', 'Genesis Block');
            blockchain{1} = genesisBlock;
        end
        
        function blockchain = V2VCommunication(obj, blockchain, sender, receiver, data)
            previousBlock = blockchain{end};
            newIndex = previousBlock.Index + 1;
            newBlock = obj.createBlock(newIndex, previousBlock.CurrentHash, data);

            fprintf('Sender: %s\n', sender);
            fprintf('Receiver: %s\n', receiver);
            fprintf('Data: %s\n', data);
            fprintf('New Block Index: %d\n', newBlock.Index);
            fprintf('New Block Hash: %s\n\n', newBlock.CurrentHash);

            blockchain{end+1} = newBlock;
        end
    end
end

% Test the blockchain
s = sample(s);
blockchain = s.createBlockchain();
blockchain = s.V2VCommunication[blockchain, 'Vehicle1', 'Vehicle2', 'Hello'];
blockchain = s.V2VCommunication(blockchain, 'Vehicle2', 'Vehicle1', 'Hi');

We get the following error:

Error using sample
File: sample.m Line: 53 Column: 1
Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other
syntax error. To construct matrices, use brackets instead of parentheses.

P.S: Here, sample is the file name as well.

Answer 1

[Steven Lord]

You cannot store your % Test the blockchain code in the file after the end that closes the classdef block. If MATLAB hadn't thrown an error you still would not have been able to execute it. Move that test code to a different file or run it in the Command Window.

[Achyuth S.S]

Okay, thank you

[idris]

So, what is the correct code?

[Achyuth S.S]

Code was correct, just that I had to move certain parts to a different file and run it.

[idris]

can you share the full procedure?